{
  "manageEntity": {
    "action": "Save",
    "entityId": "620562",
    "entityType": "Track",
    "nonce": "0x85e466e5742c02dd385f5b37d581590d9ff73d8c77ffc0e4f8066754703294e9",
    "signature": "0x3f78c0ae008d318b46b2710dcef066ae3de6f34a6cdf578b9a5f8efb57dc6f23639af4488dc8ca8dd199b8a5364df155161ce0fc43244d04c05da19db17f83fe1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}