{
  "manageEntity": {
    "action": "Save",
    "entityId": "665569",
    "entityType": "Track",
    "nonce": "0x6b23c55a1bc48a2d48b9402f41e40df2c5e6d8f63dfda2037d13dbb5c2dc6006",
    "signature": "0xcf74665f53d6eee257a45960bdcdbcd82e1caef900f26c8df2f08d89562bf301569047dab4fb118ca2002f413bef94cc5fa178b1e433ee9d314c594586ecc3961b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}