{
  "manageEntity": {
    "action": "Save",
    "entityId": "557291",
    "entityType": "Track",
    "nonce": "0xe6a45c4704cbb140429f4ee2e5e56cac477e36d6d1f93a2aa28c94b58f61a843",
    "signature": "0xcd5f66f98d4ad29df98131e080a03821ae1cffc9965da482306b8b5b6a8eafc1642409be345dbfcfbb9e1c037f4ed9ba5ffc2a1550c994bee6dc74e54dda893a1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}