{
  "manageEntity": {
    "action": "Save",
    "entityId": "958710608",
    "entityType": "Track",
    "nonce": "0x4b028631626627ba018f2d7f5291a5607aa07112e1d1b9185976a50390e1b648",
    "signature": "0x7c3f3be628d1bf423805e14a95c9988d64095a65cab09e2bcb312debc3f30e4630dd93b41c6b6fc5f2dae94c2ebbc1c4f63d7f54855a9a2fff1a7cb2373beb2e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}