{
  "manageEntity": {
    "action": "Save",
    "entityId": "1449134129",
    "entityType": "Track",
    "nonce": "0xc2689ccf93006015cf1abcef5b6f10e5b87511e87c7c7ec2714e1e0467cd4929",
    "signature": "0x3d3bddb5983d1d0fe50cd8395602b4bf80d7e14dc371b9376e84c5e1253b9c3e28f3b1e2f447eb0e8d982082ab61a9230c47b4bda35c9c0eddb2e9a8d21922671b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}