{
  "manageEntity": {
    "action": "Save",
    "entityId": "290136",
    "entityType": "Track",
    "nonce": "0x7a53f04f08dc80423481879c5644ca124a5d92d4effeccd3abca03a1bd01e83f",
    "signature": "0xd07a726dfbd00989d6a20adc69e85df97b591cb228bd15a270c2e6db6c7316622009f0214291f015004e2a0fc45630d3d603233397aad17616d16e4ca25fff451b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}