{
  "manageEntity": {
    "action": "Save",
    "entityId": "1338529969",
    "entityType": "Track",
    "nonce": "0xb125e9e61f589b00e564d971b97ec3d95e0ffcef34e8bde77da193d667b286bd",
    "signature": "0xf3ad880b08d4738241a1db6642ba5e8291c756af0ca8706b7c952f1e1a2af5eb6cf43fe9e51ecb0f4a41b2a4e6d0995d60c996038a2fc62ff5a3c7c47dcf40ff1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}