{
  "manageEntity": {
    "action": "Save",
    "entityId": "514590338",
    "entityType": "Track",
    "nonce": "0xa4dfbc021849fd499e17682290447d700f17a42448f6a7650cb6784989c38ad7",
    "signature": "0x92198970e271b7a533c9830a713f71fe6ac7541c88c99e58328f1463b784d94a00a72d5a0c532a43ba275dd65f8ecb014b32c78af932389b767fdae5c13c095a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}