diff --git a/ticc.js b/ticc.js
index acdf7e5..6844833 100644
--- a/ticc.js
+++ b/ticc.js
@@ -1516,8 +1516,8 @@ class TicCrypto {
     return '04' + this.padStart(x.toString(16), 64, '0') + this.padStart(y.toString(16), 64, '0')
   }
 
-  // cosh: content hash. 最核心的纯hex的内容地址，没有任何额外标记。同一个内容的cosh是唯一的，而cid是在cosh基础上有各种不同的编码。cid建议叫做 coid.
-  static cid_to_cosh ({ cid }) {
+  // cahex: content address hex. 最核心的纯hex的内容地址，没有任何额外标记。同一个内容的 cahex 是唯一的，而 cid 是在 cahex 基础上有各种不同的编码，转成字符串形式。cid建议叫做 caid.
+  static cid_to_cahex ({ cid }) {
     try {
       if (/^[Q1]/.test(cid)) {
         return this.b58_to_hex(cid).slice(4) // 前2字节是 cid0 的字节序数标记
@@ -1537,7 +1537,7 @@ class TicCrypto {
     }
   }
 
-  static cosh_to_cid ({ cosh, cidBase = 'b32', cidVersion = 1, cidCodec = 'raw', cidAlgo = 'sha256' }) {
+  static cahex_to_cid ({ cahex, cidBase = 'b32', cidVersion = 1, cidCodec = 'raw', cidAlgo = 'sha256' }) {
     // https://github.com/multiformats/multibase
     const multibase = {
       identity: 0x00,
@@ -1579,9 +1579,9 @@ class TicCrypto {
     }
     try {
       if (cidVersion === 0) {
-        return this.hex_to_b58(`${multialgo[cidAlgo]}${Number(cosh.length / 2).toString(16)}${cosh}`)
+        return this.hex_to_b58(`${multialgo[cidAlgo]}${Number(cahex.length / 2).toString(16)}${cahex}`)
       } else if (cidVersion === 1) {
-        const fullHex = `01${multicodec[cidCodec]}${multialgo[cidAlgo]}${Number(cosh.length / 2).toString(16)}${cosh}`
+        const fullHex = `01${multicodec[cidCodec]}${multialgo[cidAlgo]}${Number(cahex.length / 2).toString(16)}${cahex}`
         let converted = ''
         if (cidBase === 'b16') {
           converted = fullHex.toLowerCase()
@@ -1617,15 +1617,15 @@ class TicCrypto {
     try {
       if (key.length < 64 && /^bafkrei/.test(key)) {
         pextokenCid = key
-        pextokenCosh = this.cid_to_cosh({ cid: pextokenCid })
+        pextokenCosh = this.cid_to_cahex({ cid: pextokenCid })
         nftToid = BigInt('0x' + pextokenCosh).toString()
       } else if (key.length > 64 && /^\d+$/.test(key)) {
         nftToid = key
         pextokenCosh = BigInt(nftToid).toString(16)
-        pextokenCid = this.cosh_to_cid({ cosh: pextokenCosh })
+        pextokenCid = this.cahex_to_cid({ cahex: pextokenCosh })
       } else if (/^[0-9a-f]{64}$/.test(key)) {
         pextokenCosh = key
-        pextokenCid = this.cosh_to_cid({ cosh: pextokenCosh })
+        pextokenCid = this.cahex_to_cid({ cahex: pextokenCosh })
         nftToid = BigInt('0x' + pextokenCosh).toString()
       }
       tokenURI = pextokenCosh ? `https://ipfs.tic.cc/ipfs/f01551220${pextokenCosh}` : undefined