{
  "manageEntity": {
    "action": "Save",
    "entityId": "691652665",
    "entityType": "Track",
    "nonce": "0x76d29188ae59ea00bb5ad587ba606d84711a7daea0edf9dddcc0732dd4752375",
    "signature": "0x105ea475908d70f00484a5b9d8db3f776083d426b5324f85e68427e37c9ef6ef5be29d3353d54d00b7181739a65f1ee827212938623fea47eda3e6e7103f3b5e1c",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}