{
  "manageEntity": {
    "action": "Save",
    "entityId": "240293",
    "entityType": "Track",
    "nonce": "0x1c8dbc263cc9eb19442fe668c6434ec362f52e84987262141a4fe0ac92f8aeaf",
    "signature": "0xa92d8f20b3ea753eb7ad503bff1762d9f5bdd0cf365ab58c5707e20a09bf7d7c0561ec79cd565fd1b7786ede9f52b4d5835cd66e8db031fccd08961f0f55a23b1c",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}