{
  "manageEntity": {
    "action": "Save",
    "entityId": "333598761",
    "entityType": "Track",
    "nonce": "0x3e3fcd70cf44f2f6159eefeffe900e822d134625712e7c522529ea67d481c980",
    "signature": "0x8d3d7001b0d8c45be0cede5bb36dc19fbd080c02e098411079856bc67e1fafb24a55d5596e3f953232ff318260fe0b7821992cb7c201b3f05b86cdfcbc212d901c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}