{
  "manageEntity": {
    "action": "Save",
    "entityId": "1885462987",
    "entityType": "Track",
    "nonce": "0x86471bb62ae0ee699d841b045e4d4f06bd57e832008d80019bf60cd9223307c2",
    "signature": "0xdc58003dea8aaa1663294181d63ede190409d93378d5a4dbce425f805a1d89ce2c789fe158433707313bca54a28c9593dcd5627cd3d03450904e46651b2916a11c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}