{
  "manageEntity": {
    "action": "Save",
    "entityId": "770123",
    "entityType": "Track",
    "nonce": "0x6efefd42141639eb3b196a8e255f985de1b772505eafede144161303f4507993",
    "signature": "0xcf9f50ea00e05483a98fc31292f309d9c3e8600e0e18691e0cca65a98e2591045c4bca8506f7dfe4beac80ca00ba2689cd579691a8bf41c0a3e00df51b5411c31c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}