{
  "manageEntity": {
    "action": "Save",
    "entityId": "574903869",
    "entityType": "Track",
    "nonce": "0xffa859e279c68fe87c8597230e97c641498aedac37d36b9f89493e67e1dc4351",
    "signature": "0xe707e0d5a29565d8ea785eae69b9a56cb52b9e4e18a3b5bac0c0dcf0db2ddd2543d3150995f7a5bea7678b963799ceed831e2e0e2bcaad9be0bc3357cdcc027f1c",
    "signer": "0x811B619477Ea800Cc8e7fDd08cEA323eC3E06411",
    "userId": "791433195"
  }
}