{
  "manageEntity": {
    "action": "Save",
    "entityId": "615723752",
    "entityType": "Track",
    "nonce": "0x4131df12c5fcba7398b80bdc06340758b813893396906b4107c1b86653014791",
    "signature": "0xb53b1ad5c3b4d5ddf6678838f7125badcdb668a0e7e2d80e2f29fd3fa8783e4e411bfeaeab261ee6bc50e601ed010d4749c769906d737ecee175158410dbb7e81c",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}