{
  "manageEntity": {
    "action": "Save",
    "entityId": "1852644515",
    "entityType": "Track",
    "nonce": "0xa66f40266e5c8900ae1c20f3449b9e28ebf9f05d1fad1ec58287ed699d1cbff3",
    "signature": "0x1c46af5a9abd97d0fe2beda7ecdb0b02a211f3094cc617244f20137b415140b949178f9ffe3afadca9cb69c511cf7af00cb0b49d85b32f4f6b57928296fad4cd1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}