thumb|263px|Grave of Tekla Bądarzewska-Baranowska in the Baranowski family tomb, Powązki Cemetery, Warsaw Tekla Bądarzewska-Baranowska, also known as Tekla Bądarzewska (Polish pronunciation: ; 1829/18
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 0xbd13339a22ff658fdcc1dd6f99246728cb84db0a137000ad0bb523edda920d0c. 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/7265438f-0448-463b-b33e-54d769aa20a9.json and https://artists.proofprofile.net/proofs/artist/7265438f-0448-463b-b33e-54d769aa20a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
By the Still Waters. Women Composers Edition, Vol. 1
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 0x01618860fb1208af07f895db41938791308f5d548c5e36e6abfabd20947748a6. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEPI82321364.
Three Piano Pieces, Op. 128: No. 2, Young Birches
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4d4862af9ee2c276949203b2e934a8bedb222e73945027d24a765bfc03968b. 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/DEPI82321365.
'Greetings', Miniaturas para Piano: 3 Palabras: 'a por Ello'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbcae0d43922fe046288f187698442c6742c90a12fb5ea68074144ffa3c8677. 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/DEPI82308256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9370c7f3b7a37a92b7dd677ebe7b684093c86732f2329d52f358f2659b3e40b4. 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/DEPI82305252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963023a181aef26aafa53f230489b146618f7378aebab9ad5cd7fc6778fab2bb. 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/DEPI82305253.
Kleiner Walzer (Teresita Waltz / Mi Teresita), Itc 5 - Upon Duo-Art 5622 by Carreño
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a46b293056e414b82547fae9d67631ca18501c5a4e1bff9d6df0c2feb33d18a. 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/DEPI82321362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740239ae0ae7fbfb015f06be83686163f799347130e03b02b1dfc04b67e09bba. 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/DEPI82304561.
6 Romances Sans Paroles, Op. 76,: No. 6, Meditation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa875a08c0fb1bcdcc57b18f077cb8d4e419b5c8f3f2af7fba2efed553a81ab. 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/DEPI82321366.
6 Lieder Ohne Worte, Op. 18 in E-Dur: II. Bewegt Und Sehr Gebunden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007da8df69ffea0a552816fa4966442bf493dda303e81f5f7df7c331be5fbab3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEPI82308890.
6 Lieder Ohne Worte, Op. 18 in E-Dur: Vi. Am Arno. Wiegend Und Weich
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4947a9cb23846dbbdc2b44bb439e27c8f1721fd91160cc519a2d9b289696ce1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEPI82308894.
La Prière D' Une Vierge, Op. 4 (The Maiden's Prayer) - Upon Duo-Art 6387 by Rogers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1bd2298d51cc9685c9121e842b73432e9bfcb66f7d1b98b3b977496e22d5984. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82321363.
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 0x8fc907ba3e5ce5ab53c0390a9a85e33c257c8092b6995671e87260b19161fe22. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN961801910.
The Maiden's Prayer: Piano Music from the 19th-Century Salon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ef724b135d96ccfd5570218b54ab8193e4788eb771a2bda4f4db016648c41a. 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/GBAJY0337902.
The Maiden's Prayer - Leaves From Grandmother's Piano Album
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a13de7734eac9d1da761d807c0a09a19390494ac9d3b3d32faef3e67d5e834. 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/HKI199295203.
The Maiden's Prayer: Leaves from Grandmother's Piano Album
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a13de7734eac9d1da761d807c0a09a19390494ac9d3b3d32faef3e67d5e834. 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/HKI199295203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a13de7734eac9d1da761d807c0a09a19390494ac9d3b3d32faef3e67d5e834. 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/HKI199295203.
Coppelia. Brilliant Piano from the Golden Age
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27e113e0707d20532805104071f6550c7089762c57da8db7f7363c1d3f2fe1a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEPI82319218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6533c12768142613e748027ef9d6bb32728c655591fbc29a8e1d53f13803189d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEE478500069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af6ad3d82edef1d62b56b3137ea69ff06e30eba9269d3cd2c903e119a2899c3. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/AUG4B2300009.