W7 may refer to: Eutelsat W7, a communications satellite JL Audio W7, a popular model of subwoofer London Buses route W7, a London bus route W7, a postcode district in the W postcode area Mark 7
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb281b65822e33d5eee53a2a7fcb1c4b8eb6f5eb4a028cd4281285347cf91e71b. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20303d98-221c-4279-8872-bdb0531f2ab7.json and https://artists.proofprofile.net/proofs/artist/20303d98-221c-4279-8872-bdb0531f2ab7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).