{
  "manageEntity": {
    "action": "Save",
    "entityId": "474859229",
    "entityType": "Track",
    "nonce": "0x68ee66970a3fa0582bfabf58dafe1e74c92f9058f37cba64c44d1302c3972157",
    "signature": "0x16ae300b89cd905ed0591c61f84a2d1c9c428e9541d8fd2749007a100661d7fb3b3aaa55ddfcea64ee68b5413eb2be4f597e9f7c8e0028889bea8778f1d526c01c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}