{
  "manageEntity": {
    "action": "Save",
    "entityId": "770268388",
    "entityType": "Track",
    "nonce": "1790358432343286209",
    "signature": "0x2931c7210d32381b8c2bfef5884450cbe8f19357f47b6279982503cfad3ef5194d03b54c005fcb96ff88cf38647da9099800b5f9bb06d482ca75cec87e3106711b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}