{
  "manageEntity": {
    "action": "Save",
    "entityId": "121819311",
    "entityType": "Track",
    "nonce": "1792087152784566908",
    "signature": "0xdd9b250433ce257aa537854450c072e45217283b2475f2468b44e0ce611a177678c62ae94ba202a85c2a8980ddde5eef710f54aba8fd978b4b13494b6f8762131c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}