{
  "manageEntity": {
    "action": "Save",
    "entityId": "515515586",
    "entityType": "Track",
    "nonce": "0x2f28ca0f5c7189941d735f602f84820484defd03a7578aab9e7226d723f71b62",
    "signature": "0x179dbb06cca0d3469b0afb63405833f84a42d9945f78069a51d2443c467f3ccc643a3673e47de7308d48555e6d75337522cbb77ca6290205fc08cad7cfdbf3511c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}