{
  "manageEntity": {
    "action": "Save",
    "entityId": "1861784985",
    "entityType": "Track",
    "nonce": "0xe643fc910c1cb63c2a6e489abf8be127c076b9176fd967c66975ca1ddef1b711",
    "signature": "0xfb7c977f5625075a26596fa8e531e774ea4507910e05f6d245eec4a531db89586769a7ed6bcef8e7cedee14a3fe59b2bde437708dc0d707ae707e2b079661c1b1c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}