{
  "manageEntity": {
    "action": "Save",
    "entityId": "648546",
    "entityType": "Track",
    "nonce": "0x89573203853ada7e1a17688d6f8f1165571e74877dadee69dca1752db25b3a61",
    "signature": "0xf4f42da3185af27540c8936736e3f88d10705c07853046f63e162d0f82bb6cb5028ebdd706aa5d964bba8324cf64276f22f712396100d5cc6b477c9f0a267ab41c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}