{
  "manageEntity": {
    "action": "Save",
    "entityId": "378069",
    "entityType": "Track",
    "nonce": "0xcf98f3006305dd80dd652c22a0286e6048f5566bc17056375b5ebac2063d336b",
    "signature": "0xe5c88ffc5dcb3ad89ade341ce100ce30f5d123faf91516ce338e34371a931c4845f8c19acf7ac0ffe3816499e3bd7000347d5a688fe2774068dcf7e077e94b591c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}