{
  "manageEntity": {
    "action": "Save",
    "entityId": "1932821900",
    "entityType": "Track",
    "nonce": "0xb88ab646ef7f2adb03e6d854ee6aa48c6536e777cfba7c8e0dec9c1c9338eb2f",
    "signature": "0x6e9bee87c17a353b1a3a64fadfca1e83dccdbff8f51d809bef92c5bef4bbccea7961a5bb9fc08cfff3136c3c2038845ffa3427a11739e0e9cf2d5b9144da4ea71b",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}