{
  "manageEntity": {
    "action": "Save",
    "entityId": "773365",
    "entityType": "Track",
    "nonce": "0x50df038a6ebba705261c6a8dc6866457775ca5a8ef486951207048d0f794aaf0",
    "signature": "0xbec7b1d53069f25c1c3b510432d24feae5ff4ad51e6b7125ae73eb1bf1f4ac282ff8d4deacea6ecf678a69c11dc73224598c49e363cf74728e9a9d978b6d84791c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}