{
  "manageEntity": {
    "action": "Save",
    "entityId": "1879989614",
    "entityType": "Track",
    "nonce": "0xd9a25696584b6920d86a38160c8f6e7edbf6ccea84d60c4a8796ab5ef3d7a2db",
    "signature": "0xcc41ec071778486fea30ebd01c509960990af6ca74477f7a603b317acc7033a00e7d04bc5e5b21ab5b24e27f7ab0c5bc7fde5919ddf397b5a77ad023c604da791b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}