{
  "manageEntity": {
    "action": "Save",
    "entityId": "1807665344",
    "entityType": "Track",
    "nonce": "0x6c7a3155d294a4f09d06a7234772219b834ce570e8d22be24bc016ae62ab13e0",
    "signature": "0x71fc086cb025f50637f106c4c58b9ad2e1e91a9a017608b4aca2fad65b5cd51606a224163c3f628b9383e1e56ea878c65ea00cac6b78cb41688ece82628b00ca1c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}