{
  "manageEntity": {
    "action": "Save",
    "entityId": "899789441",
    "entityType": "Track",
    "nonce": "0x0034c0c031b0e039c207f1bb8e25f3be5fc0a7f1d63f929fe65c3c8bf1f0135a",
    "signature": "0x35bb9bb5776e0f074d5436d7ec4b20259de3b868acd030881a71edd5c4f564fc74013a1445d216aa105026c1e2e59315b43043adf6020cf1bf73a5e2150b5f411c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}