{
  "manageEntity": {
    "action": "Save",
    "entityId": "630269",
    "entityType": "Track",
    "nonce": "0x81d5aab77f10fe86a9c6eeeaf9d83b9b6b7b7ea0923feb6ebeaf53a5827a5b4a",
    "signature": "0x78338085a91cd476b0cf050bb0fb7c199be3780a8e2f76b3b12dc859cbad73c906db5d3dc6252aabf3a05bff9483135e2853d8a8802e8e6f2f9ee3be871d98711b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}