{
  "manageEntity": {
    "action": "Save",
    "entityId": "147198554",
    "entityType": "Track",
    "nonce": "0x38d12ebed3c337d052529d133e471e2fea45aaa874b927a4d6dd4c0449c234de",
    "signature": "0x424744005e6b86262b623c50a55356f4196bab82b33b391e35ae7301a29d7ffd1a3e37f12e8d82383e2e99ded14253f16d51402590273cad9e94a7711e0bd5851c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}