{
  "manageEntity": {
    "action": "Save",
    "entityId": "212495818",
    "entityType": "Track",
    "nonce": "0x3dd58b9dc40509a82fb90f5ef2b3d1eead7e58225420a0be9ee28de4ad093e49",
    "signature": "0x660597de4cdde373e3b659fe433b9b1e6e1971787acf7541d35a27382e60775f4f4908c6ae9b87ec1219306adf038ca48e9ef0892d56dda6b9e36f8ac8006be41c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}