{
  "manageEntity": {
    "action": "Save",
    "entityId": "518763",
    "entityType": "Track",
    "nonce": "0x8169816c289057a8d6f6626835e25fa62fb0b779f0e393e981f0b9867ad5e8d2",
    "signature": "0x7ad76a9bbe648df239f63659a7c2c6e3d7e53371c9d6583c06d62b008884d82c30a78f3ab44a8e6cbd165d027b61f2cc9d9944b2d93b8aac2b8dbf5ef5022a9e1b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}