{
  "manageEntity": {
    "action": "Save",
    "entityId": "769080670",
    "entityType": "Track",
    "nonce": "0x18f1f37e4892bf4e32feed50027037ad41b1df6b3c5a6b5059084e51b2e6b431",
    "signature": "0x343e2a35275f5667ca9c86e5efcb850d9424e22e85c64e1460cca1d5fe48bcef1032d866a022d9e487528ac78e24942c1daae6b9c56677694763c8439a3df4711b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}