{
  "manageEntity": {
    "action": "Save",
    "entityId": "3477",
    "entityType": "Track",
    "nonce": "0x5aebec4d28edaab76431e4529c0565773d442fce26d4fbb7d14471004462d437",
    "signature": "0x8e6b3dc02158ef4c022951c8fa0608e7ec6114e4a728b60b3f26fc7e1a46e49d215ff99a22a5e5780bbf4fdc4b7210eecfa0be2f81705949ba88d587cf92f7581b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}