{
  "manageEntity": {
    "action": "Save",
    "entityId": "671032108",
    "entityType": "Track",
    "nonce": "0x23eb17c5eeca07e8aa23be7ab6c09453a6b3ea2de2dfd14a6b6a960c5a70be49",
    "signature": "0x6b886dd3e6260793de5b9d638eec5d5c15186699b80ccfc2743eff1559e4c7a6467c8bfbfa4564a28f9413eeca3c91fc98fa333deb56e4cc674de3d5cae735f41c",
    "signer": "0x9B305fd00d9a363195749eec4f162986083A6dC7",
    "userId": "648443373"
  }
}