{
  "manageEntity": {
    "action": "Save",
    "entityId": "50513",
    "entityType": "Track",
    "nonce": "0x0bc60060d25355d9aef486c2959b3f3c0e96a7251831f8de3b46aeaa864aec90",
    "signature": "0x72e2c6267cedd951740dfbcb53712f37bc31dc6f4dd1730cd335967a0150c8b04a7fde46e76d5a33a78673cc4d496b952cf93e09be171b5c14b2e414c10897b01b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}