{
  "manageEntity": {
    "action": "Save",
    "entityId": "211950",
    "entityType": "Track",
    "nonce": "0xc38e2c3961cce75f19109cb4da02e3e270506ec63ff105de6d750c480f36cf77",
    "signature": "0x15a5b0ca6878314b356d57442dd8a26a1e1a482c0260fd1da18f1e9e3450f8b40da97a6ac39a0896f00deb2686ce26a81c964f83e3c491c693c8efc4c47639361c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}