{
  "manageEntity": {
    "action": "Save",
    "entityId": "144737061",
    "entityType": "Track",
    "nonce": "0xd2c8f2153573bd9a3e53a10854893e85914da7b7a642594c0b4dbbc8d784c64c",
    "signature": "0xa18049adfcfc428587dd4f7ec3f7abf2ee10073b103a9aed044df71cf125107c126f87bd6610cae7d3f7fa5666b3924c4321c3d4c671592549e359bfaa6a611b1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}