{
  "manageEntity": {
    "action": "Save",
    "entityId": "1978672468",
    "entityType": "Track",
    "nonce": "0x7012d3a3464a94c71522cb0dc04c0191c42bd4c5c188e3f0ef96c1d96c56faad",
    "signature": "0x4496fccff18c5b1075ee8b509eea25fb159ea6032389da26ecc06afd99c449ef394881ec2693625d5fa7380b3c3966553e297b68085e3a2f85f71f2d5cc0180a1b",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}