{
  "manageEntity": {
    "action": "Save",
    "entityId": "619185016",
    "entityType": "Track",
    "nonce": "0x876d4eb634ff3c8c4da8a909e7b15dcac25aa6f522608cd55cba234471264759",
    "signature": "0x816765cd6182e93bf19cc584295e2a66aba5b13ba967d9345043da97a296b2de5bcdc9da3428e40306dc307c65acec3606f73b556bb9088b17f11cd9db6c4c531b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}