{
  "manageEntity": {
    "action": "Save",
    "entityId": "890050953",
    "entityType": "Track",
    "nonce": "0x057dbef35d1e3dfb102b7322407ab464b952fc8f9488b13758d6835c483f7cf9",
    "signature": "0x920fb19d4976e0f746a7dcdb51b8314a0c0129eb8b4ef31c2b14a6186f6bc28439149a8fd349b29b1f7c6a89a79ffef3360719b2f104dea93f5412a91810c1ad1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}