{
  "manageEntity": {
    "action": "Save",
    "entityId": "465294340",
    "entityType": "Track",
    "nonce": "0x6e823b7616471d8ce3624ea26ef1b7a62194a15716ccbe765ae0944025707bcc",
    "signature": "0x7da651f11c170fc657f365dd119e20a4f5344ce8461390e5f9594fef6928060c497dc9e91fb2abcfe109d122d8e6e8bc6115f8fbbff81b255ab66b64a43643b21b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}