{
  "manageEntity": {
    "action": "Save",
    "entityId": "1521389516",
    "entityType": "Track",
    "nonce": "0x6316399fb93e5719f2f4ff8a8172328e14e5e206b14ccb148bdb69b411610459",
    "signature": "0x705a056efe775f99aba8aad84eb5e2628febf9bcfdebcd3e1ff7c8c5046beb63643b0629eb9298de235cb7b189b7feca632f25822c817a5f7b186034e209bf761c",
    "signer": "0x98fC2b30E6e70e62dB2b5fAE7b0292DE3D4323Bf",
    "userId": "480962013"
  }
}