{
  "manageEntity": {
    "action": "Save",
    "entityId": "2141219813",
    "entityType": "Track",
    "nonce": "0xe9f0ff721d391d299cfb35b62c0515761d452ec88a0fc2355d49ddc343510eef",
    "signature": "0x51e02b352cfaf6fa332452c64f0ccc85fe1e2b490c1004287e8a26f650c7dda9638d662ac5b1ead229d058e599b7f548d8676ccc825cef6e720cb0d0ede3d7b91b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}