{
  "manageEntity": {
    "action": "Save",
    "entityId": "615464789",
    "entityType": "Track",
    "nonce": "0x60185d63c820f80bc0ba0b55cc94bb2fb3cd895e8f08288f89558aefb97add11",
    "signature": "0x57f8218a5b575bb4fa512b76995b60e4d6328580cb04e06cfc184aa85ddbb74e55bd91044cd7078ad7715fc86c60aa66cb804290fa3a6925fdb5374717f6c0811b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}