{
  "manageEntity": {
    "action": "Save",
    "entityId": "749030181",
    "entityType": "Track",
    "nonce": "0x57aecbe299c69c2cb9d424d23f852515bf89ddfcd1085933b2339197a57a03f3",
    "signature": "0x9747aad4f3eb6c32fa313d808c22bb229781d2b9f8da3abf2f22bd34f385c2c37309dfac6aef6cbeeec46253f761670a013814a8c6847d49b3f7d1453618b4d01c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}