{
  "manageEntity": {
    "action": "Save",
    "entityId": "474910",
    "entityType": "Track",
    "nonce": "0x6153b63eac6c4331847e725f5018cec3de2c3ba6b64d839bf6b30cd942882383",
    "signature": "0x132073bb3a1d0acf1f4473ad1114c0e392e043243edcaa8f200cb89ed2181c0878d7e4a0a8fd014defa8b2f8ad455f1d15c4d10c7548f0309280f7ce1bfdf9321c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}