{
  "manageEntity": {
    "action": "Save",
    "entityId": "457681760",
    "entityType": "Track",
    "nonce": "0x91136ee6cb5870b59864fa5725bd0d33a109c530b09b4c2dbc7ef832c78de660",
    "signature": "0xdce9c50d8493b5d23abf9473ccec7e7342dc26efe87ac613da036586d23a9ecc62f9ac6f0e31f65074a7318a0b2d0784c277851c17913c86e7ac29694132f13e1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}