{
  "manageEntity": {
    "action": "Save",
    "entityId": "1508388206",
    "entityType": "Track",
    "nonce": "0xc616ab5a3ec2e7fc208beb457fea0df9874892b94d6c4611ad367688acae634e",
    "signature": "0x2890fec6ad08a0554c7c434fae305c8637d080000b81c280969802a871da6c4d60f25993e12d9cadd385c54514da59ad982fe95d488768857ea28ae0ed046bc81c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}