{
  "manageEntity": {
    "action": "Save",
    "entityId": "782764421",
    "entityType": "Track",
    "nonce": "0x8fc3ac0e1347ced2638768889d3eaab9e6b3a8d3b9b7fd2ee993b336905f2d7b",
    "signature": "0xcd0e6b3053744d78d4b30c446eedba1eeaf4fe984ae3758ba7a84a074eab8b2625f6a7c6b5dd227e94857c07309844c239928d3ddd110bc965fb303eca0fa1ea1c",
    "signer": "0xe9B3548997c57545A6352D16A021F6df1a01747f",
    "userId": "616597835"
  }
}