{
  "manageEntity": {
    "action": "Save",
    "entityId": "539074921",
    "entityType": "Track",
    "nonce": "0xb5d4c766f2609916fffb3b5da95ed14e533ecb6b602b3847517a5865e4b1432c",
    "signature": "0xa146050c12ebf163343c81669fe911779cbd7f9724c752f4973e1f25adc0de657899ab823be1c1c109a7b66936d51d246636b03c840c018aceb44cfec18de5d51c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}