{
  "manageEntity": {
    "action": "Save",
    "entityId": "515861479",
    "entityType": "Track",
    "nonce": "0xad8faedf7527af2a9197c87735da4537b4d653b37360d21af6d36d6036bd344f",
    "signature": "0xbac559c5f7eb00d0ac8c903bbfcf4a0d4c36c6acbad09acc692d4fa88d5c99ce6c4a83397b542a9e19a7a868523947863e6226412e4e10fde2e332d5816cee511c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}