{
  "manageEntity": {
    "action": "Save",
    "entityId": "1891121664",
    "entityType": "Track",
    "nonce": "1792406267730714205",
    "signature": "0x2536564cd2555a82688fa5aaee479193183a0bd986530694cb5e00cd09d62dfb1d529ee988fbde04c6bd78a05a81c775e5a51baddf6be2bd1659dce12aee724f1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}