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 0xbb4db34a8a49d1f0f04513c966020f5c32538993ab0c6b45ba16674510a864f5. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cb0a4ce-946c-4ba3-904b-0cbfab99ca8b.json and https://artists.proofprofile.net/proofs/artist/9cb0a4ce-946c-4ba3-904b-0cbfab99ca8b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Marche Ottomane (Manuscrit Cantemir 209)
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 0xdccc90d485a3a161fc6920d26f530411baa748ea724219b823fb27a59e22560c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379903 — a six-check JSON result.
Alef mem shin (Texte hébraïque Occitanie IXème siècle) - Musique: Vido venir tus cavalleros (Traduction sépharade turc)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cddccf5db849ae9ac88df97d708b70d844f4d88d497171f87fa733559c17e2b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379902 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf764317796ab201b5f6a6690cda90d32f4696e60a809060d61426b459c13a1ae. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379939 — a six-check JSON result.
Dök Zülfünü meyoana gel / Tanburi Mustafa Çavuş (Ottoman)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5102dee3a0652d435a168a9495843e18d8f396d9ac500a2a0b301cb0217c364f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379925 — a six-check JSON result.
Kadona sedi v bachona (Montagnes Rhodope Bulgarie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f3ba722db7d5cb4ff3b4a2ab1ed360bf9b77c3e279f637b94fd16edbc54d14. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379906 — a six-check JSON result.
Berceuses: Hajda lilibe (Roumanie Moldavie) / Fúdd el jó szél (Pusztina) / Szundi szundi virágszál (Yidish)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c69777643e0c82c8c95cc00b8edd3c886cf511452e78a7a0ceb03623993b0f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379909 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d650ba553b06d97f2eb05f4c78edc00dcc8afcaacee369e64b18b16a331449f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379911 — a six-check JSON result.
Taksim & Gulubovska Ruchenica (Danse de Trachea)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5647be6bfcf870bb7c8105e5a47c3f4136629088f8138c0e2f4d5d048e1c9bad. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379910 — a six-check JSON result.
Moma e moma rodila (Montagnes Rhodope Bulgarie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc0dfac7a1325e8fecda2207be54ca7c26e031a6a4923ed3c607c07bb1a35a1. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379913 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe810eda58fae5fb09a92af3097bc896cd5d304be18ce156f1bc2695b7b76c97b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379920 — a six-check JSON result.
Intro & Slivensko Paidushko Horo (Thrace Bulgarie)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c9763fe4f9c6e48dd956465a87ea78f34eda30425211beced882766510c980. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379926 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fa685da199b94932cb196c9736ab9fbe7d3a953a52bbcf2a5dfa53045a8d86. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379948 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305a8d13a82a32732d9467c7778e1f5551ec2a8988980c625280ae4c8e5429b9. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379950 — a six-check JSON result.
Segélj el uram isten (Chanson de Mariage) [Chant Tsigane Hongrie]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612ed012ae15b25eb19240023b5811cfa3b1748d5e6b24b536ec1125a4d2a8fc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379918 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc89ae3431d7ba6c7ae06dbb006e16a822b2a9c060e5a0566183877c51aadce. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA71379935 — a six-check JSON result.