{
  "manageEntity": {
    "action": "Save",
    "entityId": "463666360",
    "entityType": "Track",
    "nonce": "0xb15ba28a3a89142a53fc4cbcad2fe1a1931a24da9310625ed86e67ce9bf1ad41",
    "signature": "0x6d0ae5118218ba989e446f231eacfbb36788927168244df102b7ae8c248e14121d055bc78e4b0fbc04e35a0f8332bbf0799d3b7166e7cdf99df5eccb423b73651c",
    "signer": "0x72d1844BB49347afC0912B6743298568BC02b404",
    "userId": "328108"
  }
}