{
  "manageEntity": {
    "action": "Save",
    "entityId": "1305537573",
    "entityType": "Track",
    "nonce": "0x1f9cdbebbfbceba48b3cbb6de3b4e01ffacca58494346d561e6115884890c6fc",
    "signature": "0x49819ae2c9d7d7dbeadc43f44b0f8c197a167f97f46e356357a7cb2826579588010d180fda6f034efe8ac906b62242aacb2c84b8170390f9ef302ebdec8fa14a1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}