{
  "manageEntity": {
    "action": "Save",
    "entityId": "1504365726",
    "entityType": "Track",
    "nonce": "0x4757e61cebf2b15324cd381ad7272ec697dd33d57534c336fda103789a2c8619",
    "signature": "0xc23e06dfb3426e1c9757880c87b9f8eece101e2a7dabd58074dc8dd7917a2bfa3414787d26701be08df5a2215ec6baa0f6eb1b8af59cc9a2e0a8084353c824c71c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}