{
  "manageEntity": {
    "action": "Save",
    "entityId": "620369282",
    "entityType": "Track",
    "nonce": "0xf0d2e15ff10448f3e2a7d20d10ef7d7aebd5c94dd97656d4438b009d6c217b3e",
    "signature": "0xb0a19de6161f54f7a3f63dad70307c3d4bcad2f4571a69028d8081c858fdf5361ce48676dffcb30b6930ea2b48ce25c8e28fecd29720b214e8b9bb96b0e214701c",
    "signer": "0xd9bA17330fFb3Ea1356C5eC14971D9e1f2cb5200",
    "userId": "337125448"
  }
}