{
  "manageEntity": {
    "action": "Save",
    "entityId": "990409959",
    "entityType": "Track",
    "nonce": "0x7c105bb73ac9c2ed5c7de604b2d9753e1ba062ab7b3a8f3f7cc9fe1ac70eb0f7",
    "signature": "0x61c78b8b4520a81b5165e5fe8cda1898b0e8487b1c1dc0992192e9830c0b676502b2659db371bc1e164049c3da70f1f21a0893f87e16ed9cf7dfc61f29c2c7f31c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}