{
  "manageEntity": {
    "action": "Save",
    "entityId": "609919",
    "entityType": "Track",
    "nonce": "0x6c1e0f9bc897f808629ae30b1b7b56b337a606bd6b422e0821797aa1d940df8d",
    "signature": "0x8a88288d11aaae75dd980e941fabcf649e5ef4c8af7a37fa9ff87086a477beac34ac0c14a4d659d909bc2ea98cf610a98b2c4063acd1428f1346181e5e5a5f3f1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}