{
  "manageEntity": {
    "action": "Save",
    "entityId": "645483574",
    "entityType": "Track",
    "nonce": "0xaf97eebae181ee8d413099a7b058838d189bcf8266a61ac89df281b81dcd139c",
    "signature": "0xe33ed7a41ed251c5af66c66f0e9e4a5071f5b9a9e24123dc926dfd1c1a51837e1f06cf11a00f5a9699fcce6caeab48d9aa9028a726564ffa780ab0918d347d941c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}