{
  "manageEntity": {
    "action": "Save",
    "entityId": "661887853",
    "entityType": "Track",
    "nonce": "0xb028a6bd90294e6330fcbddadf5638e35d8e06986c744d316c2e50cba9853591",
    "signature": "0x18f43a28515b31f24a29c34722221a230f66548d407404af9ebd1a0349570ac96b897ccc9773622380b0bde7870d821cc0fc5da2b43c22d3dc017aec05c1f1891b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}