{
  "manageEntity": {
    "action": "Save",
    "entityId": "504421",
    "entityType": "Track",
    "nonce": "1787586424003864605",
    "signature": "0xd8acb41f19b392c6ed41bd7dc2acfaacd5b3042f663faffe0f094701e9a962cc03297b79f965f4565449ca4c1ecc38edc4c02c34c8d307747e9444d1001454981b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}