{
  "manageEntity": {
    "action": "Save",
    "entityId": "603215354",
    "entityType": "Track",
    "nonce": "0xf77504263875591f5e620a2df32bc94f4b30ea08284a60e595f62b241aa2df6f",
    "signature": "0x51c9d52c1d35fc6d7821fa584a038d8fd3dcc625ecbdb13e0ddf83806f754178304cf642fde61f14d8820c9dd8c2e435b63067cbbb651649d24269343525fd2a1b",
    "signer": "0xaBca4973b8911Fb110a95E6e00e5BBFBCa671473",
    "userId": "832058678"
  }
}