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 0xbfd279779ef505c5bd722bbff26572c7079f0840ffb41f55ab0da0a6d972f7a0. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de77bbb7-8f2b-4b49-bb0d-6dd671d61508.json and https://artists.proofprofile.net/proofs/artist/de77bbb7-8f2b-4b49-bb0d-6dd671d61508.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Carmen, Act I: Scene & Chorus. Sur la place chacun passe
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab60afadbead584263e444010d29f5acbb8f761813c0386cda9ec3ba4315813. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF058230729.
Carmen, Act I: Scene & Chorus (Cont.) Que cherchez-vous, la belle?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64ae46c1306c4cfe3094982ed9a367dc812cdae0775a30db5f2d0cdf2f68749. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEF058230730.
Carmen, Act I: Chorus of Cigarette Girls. La cloche a sonné
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d72fccf512ae04929641ead8f6f4dfdf1ec1bf5d7d2fcb4e4aecf061e85c91f. 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/DEF058230704.
Carmen, Act I: Chorus of Cigarette Girls (Cont). Dans l'air, nous suivons des yeux la fumée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc6b1c96eee013d10fcbcdfc6f0e8820b3343063475ffb3fdfeb751b69ef52f. 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/DEF058230734.
Carmen, Act I: Chorus. Mais nous ne voyons pas la Carmencita
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c33ca39ff7091b88abe8c0c0f4d491313b4b20f9df31e64fd982d2e68b7abe4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEF058230735.
Carmen, Act I: Quand je vous aimerai? – Habanera. L'amour est un oiseau rebelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12968964f8164cbf69a57e1ec22074c23dad28965918d638ab87480fbd96c9a7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEF058230736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cedcd6c4718ac0fc3e178a7cb8db118c65a8231ad639f83170fa3ccbd4ee31d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEF058230737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404c7ec309b89ee8147f85947da4212b50b0ebf4315bb283292c79e6917f8bc1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEF058230707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb242b550d98456fd5d4958ad196a295be765d9a8831b8c62ec7fadb77d0ec904. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEF058230746.
Carmen, Act II: Toreador's Song. Votre toast, je peux vous le rendre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa254d244931a4af35f0540a6c4d7ca3f33df6699669ef3a93903f7d1ecaeb2a5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEF058230712.
Carmen, Act II: Finale. Holà! Carmen! Holà!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35206a5aec7ff662920ef7cbef464660b1caa0f0f442531863f699baacf193ce. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEF058230752.
Carmen, Act II: Suis-nous à travers la campagne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d35b6a50fef6079a5e6e5541830d3b97c2006a0ee189fb1ea3bb31775f03bc9. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEF058230753.
Carmen, Act III: Dialogue. Alerte! – Ensemble. Quant au douanier, c'est notre affaire!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357a3825e43edb9538f0bd455d2aecaff6909e048795506708b5005864fd54e0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/DEF058230759.
Carmen, Act II: Messieurs les officiers, je vous en supplie – Marche
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6041dfc4c12fbda31665178e7778f594c56c86f975e3b02d933f853b84308c4. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:27:14Z), 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/DEF058230747.
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
Carmen, Act III: Sextet & Chorus. Écoute, compagnons, écoute
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b95b964627be0bf3f3cc0cfbfaaeb691be423c81706de4a0f1672d04797c35. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEF058230716.