{
  "manageEntity": {
    "action": "Save",
    "entityId": "148690",
    "entityType": "Track",
    "nonce": "0x39272823eb16c4bbd7a246395e40aa3c97e18cdb19ae805ea0fa6ea5f15ae4b1",
    "signature": "0x3217c71b22f28a107a4ef578d6c4174a62a745cec4ec2b21551881006c2a26117cdc7c566ff47a3f8693aeb68d83689b6167c1d1e194aa3d7ce21a645cd032571b",
    "signer": "0xa185Ff45de6FF68eAa1d7ceC338cba250810134c",
    "userId": "54166466"
  }
}