{
  "manageEntity": {
    "action": "Save",
    "entityId": "634478603",
    "entityType": "Track",
    "nonce": "0xe266f8b12f1d98c1625d0da4ca8ecd0c71523ed7f0599566e3a689a179826ed9",
    "signature": "0x6417b3cf52c42b336f1f8b32cf6f6315d27093cc11931964c3c46cc8f49ba5ec30ea335e536aea10f43ed0e041f9255403a9454949257f3d4bb0eaeb0fea5bd91c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}