{
  "manageEntity": {
    "action": "Save",
    "entityId": "855266306",
    "entityType": "Track",
    "nonce": "0xa6ec354defbe34cc493e5ea5f069893ddfba5fbb8cbef771911931ec77898d43",
    "signature": "0x704514fb66ae5f6a9e5b7bda8e70a79f2d7297bcb1186318b776019b65d26dc908d6a242dd154eabdd0a051854944921d75cb20557cdaa2833b813af2d2b545e1c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}