{
  "manageEntity": {
    "action": "Save",
    "entityId": "404663921",
    "entityType": "Track",
    "nonce": "0x2b8c011bac0166c4a0e95857e7493ecf9b83d601ddfc3b4e54a47234741de5a2",
    "signature": "0xb03e91e9932bf6d156a019334914fd0570e28e0f9bc98cae3a35f84f3f9fe02f3b4eb994f1ce7ee16075b208b14f099463155e6d511d8b28ac09a28a9b5911bd1b",
    "signer": "0x38b82b1Cd46eCBa50DB7fB20B1FD260725058884",
    "userId": "672217540"
  }
}