{
  "manageEntity": {
    "action": "Save",
    "entityId": "1374450048",
    "entityType": "Track",
    "nonce": "0x877d854565747a8739ecbbd6f5d43e4dcf6b5a832ecc8d3cea56bc65881c0883",
    "signature": "0x5f187102fa8c8ee40b01e11b3abdee6173a647f84a919bc4193b2f3295ab2d0f28401363586555016de23a745bfd0d4022ff4b35748c2da60cba7d77d70d8ff31b",
    "signer": "0xab28764Bd1224556ebA1d8Bc48d3f1F5D2e4E1dD",
    "userId": "281054123"
  }
}