{
  "manageEntity": {
    "action": "Save",
    "entityId": "505916",
    "entityType": "Track",
    "nonce": "0x415860ca7463be256d0c2f2f2d06b47395080812da95c3e9ba8d454e9ddafdd5",
    "signature": "0x7dc34221c87820e7c824a2b0f2a5baddabfa6815e1422d76fdde85370b0a54ee6fbbddcc920ad8aea599631ad93903eb74459b01ebeddc29b2c0792aaa9021d31c",
    "signer": "0xfa1f98f0530E55C2BEFA45f0F1B3A699b4559136",
    "userId": "149566028"
  }
}