{
  "manageEntity": {
    "action": "Save",
    "entityId": "222641",
    "entityType": "Track",
    "nonce": "0xd4ae4c2ca7b90d8bbbac39eaa912ffd80a590959f30379ae0375a61f28c7e607",
    "signature": "0xc3fa7c582139bb6301cda976b8b0beb3f4f33f76f81aba12c31ba5bcfc6c5cb94c1c0842055e4d944796b437ba136b1d4a44dbab53b55da4361a35b3da76b4e81b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}