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 0x25f272d87ef6cd006975c8ced80a7447f7747c2e537d077b2ed9c29d893b5a6e. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7181c8f5-8944-4829-8ed9-3cb8297aa894.json and https://artists.proofprofile.net/proofs/artist/7181c8f5-8944-4829-8ed9-3cb8297aa894.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x6adf0af95a5ef1532ad5b5507c633a3919eea9ed48bf40cda3d8bb91751e3383. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BRAZK0500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0d6a3b3f156c4bda767ba73b9a7985afea18867b0de6a5df69ce95e43a18dd. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600001.
Leha Dodi : Breslav Nigun / Turkish-Bulgarian / Folk / Nigun Carlebach / Boi Veshalo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ad2a201a459832872b5cfabaaaa9b22f7cc36d216d1c7b20be4ef0b6238c68. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb27a94f13347d604694fab0a59c0b23d9cab553fe12a525be57cb7bad4a32b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8712b3846ed920abe1300445d7138b666e1951aaeb7d64ad08c25a7abebfc57. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65150f32cff5f34b4d521ec0018985c603c756918353e79d337705f7d21f4798. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5200f134f55a057bea554198929d0587d66a75657d369b907eeb00dd6ef08e8a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce11420bf347c63dda19d70b397721aac74cc5048cbc3cfed7fe22bd066dd11. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85f14613f8198b4933fcf8ce640d258f23ffd43737f71910d51c9a380fe4bc9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa90cb8d2713b116e7d4f5c9a7906677bc946597d170ab2427dbdb62db9dac66. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7fbd2344f7dd17a8420a3d17560eaf611ba99d8b2203a6ab8e5117c192886c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994d010ac1cd8770b2189125b781ea812d09654e41df499be628f06d4e411aae. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BXLX61600011.
Guitare du XXième siècle (Prefaces Leo Bouwer et Arnaud Dumond)