{
  "manageEntity": {
    "action": "Save",
    "entityId": "420877",
    "entityType": "Track",
    "nonce": "0x2f01745ff182cd6a92bd2bf35ca6b5f794c996c2b7470e4d8cd57bd7a9aedd48",
    "signature": "0xf5e04d3ff256af6c01afcbf0a5a592970c132eab88b3443e21dc3e3952e5d4dc26f6a1b313fcd70b1abd5c4b72397527bf4abf03f287fc44211cbf014f4bacb21c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}