"Yankee Boy" is a World War I song. Lyrics were written by Fred Ziemer, and music was composed by J.R. Shannon. Vandersloot Music Publishing Company produced the song in 1918. On the cover of the shee
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bca2fcdbc68960af7c66d2baf8d5ef90ffc0162da1048be0b203e7af56c9be. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1464e4a3-1b7e-467f-9301-fac274502fd2.json and https://artists.proofprofile.net/proofs/artist/1464e4a3-1b7e-467f-9301-fac274502fd2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).