{
  "manageEntity": {
    "action": "Save",
    "entityId": "2133946455",
    "entityType": "Track",
    "nonce": "0xfe2121e666138305ff0115fc6d458326d23610ed9346d2dbbefa9d300ddaa766",
    "signature": "0x1beab2a0bbf122618b619c3656cd220edf028e039029162db7f5347817dd2239334d4141e51751228693757dc9f9d8523b78c60f48c3f23207ca93759a91f0ed1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}