{
  "manageEntity": {
    "action": "Save",
    "entityId": "339542433",
    "entityType": "Track",
    "nonce": "0x1e7870fe34a6aa5274cc642ab51c85f47efd828ae7fb815519cd907dd594a450",
    "signature": "0xf1d6d447b1f7de5fddbf38b25e4c6cf1cf172ddcbfbf10afda1b197e78c0829b3a9f945b526ecfb30781792234ff42861c60049683992e26a7c3def3b2a10a2c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}