{
  "manageEntity": {
    "action": "Save",
    "entityId": "261907318",
    "entityType": "Track",
    "nonce": "0x31e1c91e02978ecdf7e4efc28be0b5075392d2441279691814c8949a81e9063a",
    "signature": "0xebe0f8063555daacb9204c055d6ada96cf74aec99ced3a6a76d7764c72376361310dbcc6e35b2314d83bddea8115ee12b378476d8d505b0eb2f4d52167396def1c",
    "signer": "0xeB50CcBe2f6fDC265AcDCe776803eE55Bea32738",
    "userId": "121537"
  }
}