{
  "manageEntity": {
    "action": "Save",
    "entityId": "345616833",
    "entityType": "Track",
    "nonce": "0x3e920502864565f7cd6247ba0e2615449c2edd09a8e0c1cd4ee619a1c8b3b32e",
    "signature": "0x8ae840e829920c4b2faaa35b178214d9cefc27abb12e2689f32566546344eec72326aec67ecfaa89dafb11b7b21046260f7188d45dcbf05ea83a8839310614fc1b",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}