{
  "manageEntity": {
    "action": "Save",
    "entityId": "645145691",
    "entityType": "Track",
    "nonce": "0xee91a8f433a5bc71746e6f04f39ce67a9fc1cf3b7be054eee3c3c173318f4d7d",
    "signature": "0x3d50e7accda3b7d339e4053d200fd1645463f8c1c01039c772d884ef7858991308c17f2a3b225e3cada349991dc91bc19058ba93e17629e1bb5f3aac7c070aa21b",
    "signer": "0x3324C23609BC25902C39CFa38CF40581c7Bc7F87",
    "userId": "229134011"
  }
}