{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890801652",
    "entityType": "Track",
    "nonce": "0x389fd0151418aee91509cac967804a13cdfe8a407b69d0d994474e7c46171375",
    "signature": "0xc2c9e94a1b11b7f7e9bb102f9964b58f1c719b647cedfbfd22263a722a37f7dc172148d845b088aacf84e4bba145e8dedf5066e47829609e9bb28d004fcf2e601b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}