{
  "manageEntity": {
    "action": "Save",
    "entityId": "660243210",
    "entityType": "Track",
    "nonce": "0x7528098bdbb75d53e9f6cd076fc0a5da9f9ef3076aa90a6df277d2ade9f47396",
    "signature": "0xf827e775bc4b4ff8d70c44fbbe51137c00c7c3af91f4a8a7cb1aef7275ae096550557199c4641ab8a8ebfd2f0027b627336576b73451336d2bc472242edcd7b41b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}