{
  "manageEntity": {
    "action": "Save",
    "entityId": "718846436",
    "entityType": "Track",
    "nonce": "0xe527af95338f04b925d9677dd48bf8492402683adac5d4bb4fcca72f5e930e17",
    "signature": "0x3bbb588ff21f68b92bcc4ac8fc6479f2ee1dc484fcd3130b3f36a4d1a174771b04f21f9d2ce1ad5db3d1524f34afeecc9558b3e1a31a49e6deb20b688bafb5a61b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}