{
  "manageEntity": {
    "action": "Save",
    "entityId": "666132",
    "entityType": "Track",
    "nonce": "0xaba1df214ba9b93b7e11fd368af5430d748794cf092c360380db82f13526bed0",
    "signature": "0x95bbeec2c167f04a97dcdc086f0b41505f2f66b5faaedabe8e6e4dd07f8fab173aa3da22f128b8a0bc6b325b6ddd26bb76d3d7c300d684bc4ddb28e002df87221b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}