{
  "manageEntity": {
    "action": "Save",
    "entityId": "1501372551",
    "entityType": "Track",
    "nonce": "0xb1bc4fc6204f3f78f5797eea6ce44495a77f67329e48566aea9588c3a75ddfb8",
    "signature": "0x83f8e3546090051ca9a018e989fd5633aa06ff5d4d0528eb969e2f788d12e3ba63aad9932e606f9f70cba531969b591fbd2da47e8d3a79adc042efb3c8d61e5d1b",
    "signer": "0x591E8b46f0D8b7a1FeD63222b6e5E3EaBe2900F6",
    "userId": "877370116"
  }
}