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 0x02267e34c9b4be56c0bca896bdda9a710cd69c436a2f44a770f0b12dcf412eef. 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/cd2ddaac-ec70-44c3-9d59-6b5e7374bf04.json and https://artists.proofprofile.net/proofs/artist/cd2ddaac-ec70-44c3-9d59-6b5e7374bf04.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Burgmüller: 25 Leichte Etuden (Digitally Remastered)
25 Ètudes Faciles Et Progressives, Op. 100: I. La Candeur
Friedrich Burgmüller: 25 Leichte Etuden Op. 100
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 0x00ec9344d9ce47247f9db173eed3a24cd230f147d064122651c01b6b7571f139. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T20:57:44Z), 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/USGZ21034759.
25 Ètudes Faciles Et Progressives, Op. 100: II. Arabesque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275845403f1897be43a43434d40ae64607103aee14a204658644a1a94988cb52. 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/USGZ21034760.
25 Ètudes Faciles Et Progressives, Op. 100: VI. Progrès
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65df48c75d192bc995b3740cc63cbaf458a4029322b38db7914ef4bccefe5132. 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/USGZ21034764.
25 Ètudes Faciles Et Progressives, Op. 100: VII. Courant Limpide
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3e0710834df0c40f5205fe91e204bb8154eea404a84d9fe99a01370b69258a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USGZ21034765.
25 Ètudes Faciles Et Progressives, Op. 100: X. Tendre Fleur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67d0f73bf5580e4962de85bdc7e56830073d320ebbe7f0431595a08bef0e482. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USGZ21034768.
25 Ètudes Faciles Et Progressives, Op. 100: XI. La Bergeronnette
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fef9d69461ac8f6c38c429e2c8001aa1c48bd950e7c9c31d05a7970312c773. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USGZ21034769.
25 Ètudes Faciles Et Progressives, Op. 100: XV. Ballade
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39226f66cf83e3061ba589d75891e7cd5c91323bfc9fa5a6b90d7e9973998257. 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/USGZ21034773.
25 Ètudes Faciles Et Progressives, Op. 100: XVI. Douce Plainte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43d61acd0b59532fc637ba2d835dff61d5bfa8c2ab0a5a43cd71ae67223384c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USGZ21034774.
25 Ètudes Faciles Et Progressives, Op. 100: XVII. Babillarde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74d3ae743e31f91ab8c1e91a2547bd3531ced75fc5ea79b5fed2005e8f84c90. 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/USGZ21034775.
25 Ètudes Faciles Et Progressives, Op. 100: XVIII. Inquitétude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968ad1294422295d4fdfbf6bf68099006907e1ae992f9fd6e3b9508b8da076d8. 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/USGZ21034776.
25 Ètudes Faciles Et Progressives, Op. 100: XX. Tarentelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f79aa2a5c6176e7d06094272d03104962bcec29600d2b1b21efb1790a79b920. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USGZ21034778.
25 Ètudes Faciles Et Progressives, Op. 100: III. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cec764676b9de1af6ae62ef9c58f7592cd0db9677976db2206febeaa751e085. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21034761.
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
25 Ètudes Faciles Et Progressives, Op. 100: IV. Petite Réunion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3927698a28651972fe8bfbfffcb70e8fa5bf5277708ecccdec41acaad09a892a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21034762.
25 Ètudes Faciles Et Progressives, Op. 100: V. Innocence
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff76044a3646498cc69906767ddccff87e4cdbb780557e1607f811276b8597ed. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/USGZ21034763.
25 Ètudes Faciles Et Progressives, Op. 100: VIII. La Gracieuse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48b23cde0c6e05a8f98aa1acbcfffa6901e307eff37a1781086efc8bf507cc5. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USGZ21034766.
25 Ètudes Faciles Et Progressives, Op. 100: IX. La Chasse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a39f4dc65dea59dc4f2e282d6b1775e93076077b76b5818db59c4a8d581220. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USGZ21034767.
25 Ètudes Faciles Et Progressives, Op. 100: XII. Adieu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e5e239364ecf0d375979b1f2acc6a32c33e5314086fedcdd3f2d915b7c6613. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USGZ21034770.
25 Ètudes Faciles Et Progressives, Op. 100: XIII. Consolation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78dfaf7a3fe9b666165a54348b2e18c7561a0a5d503bc71c14eacd88e27ac1d6. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/USGZ21034771.
25 Ètudes Faciles Et Progressives, Op. 100: XIV. La Styrienne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb22db798eb3e5b9410bae9ed574f43aa988c6057b5f247a21803756dc29941b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USGZ21034772.
25 Ètudes Faciles Et Progressives, Op. 100: XIX. Ave Maria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff7b4bc81c408d7a0c66fb0344018c3a798ff0dbeeaf799237764b72981a743. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USGZ21034777.