{
  "manageEntity": {
    "action": "Save",
    "entityId": "938454287",
    "entityType": "Track",
    "nonce": "0x128729f1ce74726679907391510c5db0ceb7c0b73dd71a3042080f72a9397a72",
    "signature": "0xd58333eac9136f59d89d60c2d9c83b4fb2be614a2d65aca02565d1a066fa54515df7051af4065a7edcbd7ea8a46d73db4f51df08ffd5ba090eea3e41d59579221c",
    "signer": "0xF87587C13c555f8Cf5Bb30345cC7B999Df0560c6",
    "userId": "939051306"
  }
}