{
  "manageEntity": {
    "action": "Save",
    "entityId": "1906823505",
    "entityType": "Track",
    "nonce": "0x300c346b539936ad5938f6265fde5cda67cf0d35c8305f5626a2726aa1ad17f2",
    "signature": "0xaac14f178048e9665ec91e0191a40c45cd5700bdc7830a9789e01e8b1c06dc4c43ba62a2e2118635b270dba3cf0d0e44cbe4e32b36f20861f852a0c5997d29c11c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}