{
  "manageEntity": {
    "action": "Save",
    "entityId": "191801400",
    "entityType": "Track",
    "nonce": "1785738013815634110",
    "signature": "0xbf7e79184a018de1d919df55ea49ad2fec890c424eecde0e534f8080629d9e6c26fbb20103ea98301f4cd6b926bc167a91483097206d52af8f12acffd2a4ed851b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}