{
  "manageEntity": {
    "action": "Save",
    "entityId": "391814965",
    "entityType": "Track",
    "nonce": "0x9c8a0c3324f3dfb1d8a5d4751b7d12d0bf55e11cb3ca1076117bd88ad8c8faba",
    "signature": "0xd79527b23d5cc407dfc7c15c4e357b09fd3eb44b593a5edec8637083bc6886b658ee7a68be8b1cdd79bb6bf27bf4858805b6fc70820cb9bbe97d15b12a055c9e1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}