{
  "manageEntity": {
    "action": "Save",
    "entityId": "748863960",
    "entityType": "Track",
    "nonce": "0x972c87d239057206d162215fc58b5e412d62456944c75e525eb7f9a7306a0974",
    "signature": "0xbb2216a3c41de88d0f6a2ec766e5714ab8187fef7b04214a594b34575c607b4d69634fd802c3be84b89992d5ba05e1ea02479b5c35f5a9f1b762b7470061b0471b",
    "signer": "0xF40Be525727aa96Cf61609f0A493d9E677f73a33",
    "userId": "159460377"
  }
}