{
  "manageEntity": {
    "action": "Save",
    "entityId": "727929",
    "entityType": "Track",
    "nonce": "0x6fbcb97bc0fed1770f3adf10cd6c14147596e713c9da00e4f9fef6dfe641e551",
    "signature": "0x62f4983f045f6614e52a508b1d1d2ce07174dab4fc755d4e6083b0c6aec9b0a5788fcedf203decd129cb0fefdd83c6e512ccb8b4717ef537dc484a2b8ec8d0bf1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}