{
  "manageEntity": {
    "action": "Save",
    "entityId": "947904873",
    "entityType": "Track",
    "nonce": "0x46cc7e1039bdc6776244336ff889e7c6269cb0a47e605657b20fa832afe4afea",
    "signature": "0x1354e7af1318462f26e5b88a51edf7de62f20c1091569bc4d55e36b65fedfacf01e7d58834321b33314d04191b0e2bc5663daa89b57c21ad22eeb06d95f82ad21b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}