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 0x1060fe57e03d5a42bb9ab96524b75056d7b45b081f277a8f686f4d8147180585. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f965e544-6c75-4c96-96e1-4443fa63842f.json and https://artists.proofprofile.net/proofs/artist/f965e544-6c75-4c96-96e1-4443fa63842f.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 0x07c179c790cef65a9445341de4031ee04151108a7ab8b60a2daf73904f4e9fac. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLB351218609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf16ba05bf6a164f2c2dc2e984acd0a1ce3a3fbd0e4975d0fb293b2759c8832. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/PLB351218610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e28cc60e42a9206cbc99c487d6dd68dfdf34e5226b4a076cb1d6c41b905f8db. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLB351218611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa009dcd4910bfd80f261df33e30a446199d8512eeb0df6063087243bf370269c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/PLB351218614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedc3df7f6261ee11da3ff50770707756e4e184cec138d85127a17d36f5e6163. 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/PLB351218616.
Zieleński: Offertoria et communiones totius anni (Excerpts)
A few words about love… / Kilka słów o miłości...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafc55b595e4739d1a3c041fe1a47c9cdd549397501d0f1e58c1f9fd476d3d3e. 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/PLB351421115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40d7923e875fd61b52b4157c4b3ac462b49da30cb6f02ad1c7177aa4afd653e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/PLB351421116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13287c5272d6463c38ba6bcb03f80b34e73b83020a7615cd8e7e952812eca8d7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PLB351421117.
Op.52: No. 3 in B-Flat Major "Zwiegesang"
17 songs, Op. 74: No. 1 in G Major „Życzenie”. Allegro ma non troppo
Kyrie, Sanctus & Agnus Dei, ZWV 26: Ia. Kyrie eleison I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aebd88723c93277084c601346b58cb2803178429d7d0471a32da9a57554f117. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DECP61910001.
Kyrie, Sanctus & Agnus Dei, ZWV 26: Ib. Christe eleison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d7307cb8bc21329bfa58bb9f385d6b54ab16ef5e44bdd03ff51914302ce6e6. 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/DECP61910002.
Kyrie, Sanctus & Agnus Dei, ZWV 26: Ic. Kyrie eleison II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a73b527defb19d41872983ee073b7574598b6c7db2e2c7b009f43c63c10c728. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP61910003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dae8654380d83e0357378ead7c86aa421f6e00aed68fd43534ebeb75eb2ed7. 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/DECP61910004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3440ab11fc393d938e27d63aed57482b3da018940957f4fe881b1e5f2b6b1697. 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/DECP61910005.
Gloria, ZWV 30: III. Gratias agimus tibi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb102b3f4093742068bd059485a549cb66cdee988ddf0ad1e5e69baddbd8b14. 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/DECP61910006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87e6c2d56c4d84ca4f7a2a4cd2fa2bb735089125cde9874fbaace9e8fde675e. 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/DECP61910007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7d7873425eafcf56f0d22f0f5d177249329bd131c53a1cf14a72a19304c213. 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/DECP61910008.
Gloria, ZWV 30: VI. Quoniam tu solus Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cffc2ba6435bf50e1fbd57e31a79218fbad045ce8a6bbf4729932ed51f0ad1. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/DECP61910009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff32811f78e04b1fd22d20fe4bda042bac47b7d56dfc290e62ddcba4013693a. 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/DECP61910010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1029ee22f3cfc71ace5d5b8a57a0728ad5767a10599e8387e27e9432504b82. 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/DECP61910011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e8c49bd5dd3a9e8542460f6478c49e4686f5ac187095252ea11d854af085de. 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/DECP61910012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553c8acca6c4a81f32f2d7c2804781f5d7d6f186c53915e4314e2ad0353737e4. 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/DECP61910013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb301eed9983597fb6cf35d98a1ac48bd0ba2d08bebcf588a90043abf00511f7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DECP61910014.
Kyrie, Sanctus & Agnus Dei, ZWV 26: IIa. Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1faa1269b25160942954817c869882e4bfe7affb194b2c33fbdf30506ca5aff3. 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/DECP61910015.
Kyrie, Sanctus & Agnus Dei, ZWV 26: IIb. Osanna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabcf09fa65768cb5c514e724eb35ddeb3dfd51084ecfc8ad96ed4f87b9d21f1. 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/DECP61910016.
Kyrie, Sanctus & Agnus Dei, ZWV 26: IIc. Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122d56b7df49dcb2c9dfab5272eb018057016442b1ad7cd4c83c8d70104ad2c2. 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/DECP61910017.
Kyrie, Sanctus & Agnus Dei, ZWV 26: IIIa. Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34279ca19412f39e2e1134357e948c43d4854ff0b9d32949799020ab0c8470c2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DECP61910018.
Kyrie, Sanctus & Agnus Dei, ZWV 26: IIIb. Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a94c86344f647503922ac318d774a88e45af88e1e953fbc8bae344a8eda49c9. 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/DECP61910019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02861a864a53bad7ef2f541a3ab8dfb0c0eb737a075fb858056ed0b3128939b3. 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/DECP61910020.
Antonio Maria Bononcini – La decollazione di San Giovanni Battista
Żebrowski: Vesperae in visitatione beatae Mariae Virginis
A few words about love... / Kilka słów o miłości...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbf705daa4204e24dd17884978542b2c987db247feaa3071870d4db6474a589. 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/PLA292100131.