{
  "manageEntity": {
    "action": "Save",
    "entityId": "402194730",
    "entityType": "Track",
    "nonce": "0x6a71137cf417f2b5f6b4b55ecd012f701c4c90680af55f7a613923d123781207",
    "signature": "0x2607ed4a2a049c9efd0427b8f913db3e300db15a5d4f505d9801e7145faa372c5c8a4494dc03395d7b0688315b1ec8791e12306deecc67589655a334a992b43e1b",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}