{
  "manageEntity": {
    "action": "Save",
    "entityId": "587501567",
    "entityType": "Track",
    "nonce": "0x67ff5924fb5670457a2a8f83a43a7dcd5ac2fd61180b595b4a45dbb8cb5a769c",
    "signature": "0xaed47d1c2f185a12fb0202792d810253cbec3a441a6d818fdb55b64855ff1cb737bfdaa5bc6a8622e740cf58c8334c5ab084a9d4364b302357164cbc0ee7415d1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}