{
  "manageEntity": {
    "action": "Save",
    "entityId": "1595859757",
    "entityType": "Track",
    "nonce": "0x2b6377d9e62a09fb1ae1a406bd8c0fd207f1c8970cb5a032183c25e343a0a825",
    "signature": "0xd1ea75bd8df4cba1c11eb2f55c85371dae014fadb2b86851b5cb0e68a8d6283c299d22abf88bd92417a3a9e6c45296ce0736b2323cef745fed3be5b7fcc4371a1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}