{
  "manageEntity": {
    "action": "Save",
    "entityId": "544577",
    "entityType": "Track",
    "nonce": "0x1c44f595d122768f2d6652e0e3fb5a90ba71fc01730ba2558b2565b3f22c0c43",
    "signature": "0x9d3d4e501f578908d631d1da5ce47d055f7566de747f3c5a45b039f3569b9820535e4b7c1992c61bd46afc81f46ad3ba824eca8868b08ac0b52c425ae7a612a01b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}