{
  "manageEntity": {
    "action": "Save",
    "entityId": "1653219793",
    "entityType": "Track",
    "nonce": "0x8f33fcf5550dd7c0c126cb974f67a8e7d6b9ed1d92f1cafee77c1651548abcff",
    "signature": "0xe48e380ac2a081e744989d2a52148d06cc40b9ce2d6ac5f498503a2c5c91460702ca418df1d9deb8b05b359ca5ebf3f3dccd343d5986ac44e019eba6e5092e931c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}