{
  "manageEntity": {
    "action": "Save",
    "entityId": "221388",
    "entityType": "Track",
    "nonce": "0xe42ee84d9dd8c5b5311d799c83a240a77e83667ea2c8588a737735883be64ad6",
    "signature": "0x0ad95c252f6eb4751b3fff03492b31858e8f34e8c7e213f7effa486bc421d0156cef4eb31ea69c3f10cc61669336181d4f2259ed1e66cb487b30c6469bd4a1401c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}