{
  "manageEntity": {
    "action": "Save",
    "entityId": "620849012",
    "entityType": "Track",
    "nonce": "0xf4daf75f2d49cc19188a701560afce311e16b9c6fe831d4ccab67cb9242480de",
    "signature": "0x93ffcee297410155f37897f5c4208b1aaf119a018c6bdd7a0b70e765b6f417da0701bf88902259db8c40e66f3ba86a1f3d89b7c4870503a88cc3282b5d7cd0c41b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}