{
  "manageEntity": {
    "action": "Save",
    "entityId": "988057",
    "entityType": "Track",
    "nonce": "0x9ddbd7251dca41f1d9e65c6739b3806652f4b8c820e0c599babd84037f1c6c99",
    "signature": "0x5d5e7d5a371a30a0187aea08db61e79d9ae1f9f2e7fe6b63edb3e9bc8f231d04549abb1aa27a5410ae08089db9bc078e88c035e78da8b2fd541b3b36d62b77b51b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}