{
  "manageEntity": {
    "action": "Save",
    "entityId": "684453050",
    "entityType": "Track",
    "nonce": "0x352627047a9766a4a6f07ae4a83b6ce9997e867c55e19440cdc8efcab7e32795",
    "signature": "0x28be500fe612383232e8a93993564687660aa6035e3ea1f8be4100b4fe3218287c3cdea58c43e79d6db003a5c7594aa6edfe2b42636901b2adbb7c153522fb891c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}