{
  "manageEntity": {
    "action": "Save",
    "entityId": "1787592300",
    "entityType": "Track",
    "nonce": "0xf67e9aaaf9f5e1f921225456fee972f4aba68bfecec1f131ebdb8608dc85f621",
    "signature": "0x04a3915884b86d0963ff6bc8ea589f6e6f3bd2f7ca0138e366ad4ce39fb8215c6c73b93d37c79555136ea696ba7abae309d340f9ee0a8fc78d4d2fe6563d24591b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}