{
  "manageEntity": {
    "action": "Save",
    "entityId": "617530",
    "entityType": "Track",
    "nonce": "0x39a9534a6e3e6d7deaa1ec89dfdf3cf46a5e4c73c3b22f29f16f5448a5015d17",
    "signature": "0x0949c7f7709add346a349f589133b6b1f55976d4f09a857efee6923a92919d0843a1cf94d9a8bb8b9888fe0f8a877c29c9764dd5d040ed770295dbec3a151c991b",
    "signer": "0x9FF2A7F5Fab732dA57359bb3eD63a95511bD1329",
    "userId": "67863854"
  }
}