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 0x074eaca44c384d71d3999f6465e9ee9c2c35fb4475eda9f0f8ca6e5f5c6dbc92. 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/788fe487-c153-483d-b27e-b94c17780d31.json and https://artists.proofprofile.net/proofs/artist/788fe487-c153-483d-b27e-b94c17780d31.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Antologia Musical Almanac Sardanista Original d'en Tomàs Gil i Membrado
El Mestre Manuel Saderra i Puigferrer Dirigeix les Seves Sardanes
Sardanes a Sant Sadurní d'Anoia en el Centenari de la Fil·loxera i el Cava
Centenari de la Cobla La Principal de la Bisbal - Vol III
Centenari de la Cobla La Principal de la Bisbal - Vol II
Centenari de la Cobla La Principal de la Bisbal - Vol I
Centenari de la Cobla La Principal de la Bisbal - Vol IV
Sardanes Al Voltant Del Monestir De Ripoll
Sardanes per a Ballar: Gravacions Completes 1 (Cobla Oficial de la Generalitat de Catalunya)
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 0x084824244dfe1eecb251bcad806f8718475f58bda5ddcfa48c9afa7614e0ce10. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/ES7581310195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43c50976712e193d7591e6039458584e96b1a7505d68890b8d9ad26c68d608f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES7581310197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ddf5f76699c552b69a3be890154a8a4214c8c311c87d1d18fbce875e171dea7. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T11:23:43Z), 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/ES7581310221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53331c424c4b566bf21010ce62e679d63aaf0e193c455296ef490410aee288ae. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES7581310196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3cfdce485780bf64a5c244df8dc55402d696276081ca6e5a2069c2060ece60. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ES7581310208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0da8e4925fdca2e619f2c2e37b072501bac74ce7a539c3141a11789ab7b6f9. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/ES7581310219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791b533c6da7c8f663f3b49a6091452e351d589e6a3cf1c19994c2f811381274. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ES7581310184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8219e3b48029be014e009ce77cfdc8ba5248f266e655544538a38efc2b9e9a30. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ES7581310209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde24327b3697de9cbd60068e9885a680314b01bb730f61486af65593393ef413. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ES7581310244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0822858aa02244c07e3303264889a27abe52604bbee6253607874ebea00eaf24. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES7581310220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e00dbbd4169a083442c2cb3e71e2d0456ad0afae4d533dddb581442f5195cce. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T16:36:39Z), 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/ES7581310199.
Danses I Entremesos De La Garrotxa, Volúm 1
Sardanes d'Antoni Albors i Asins, Vol. II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc366b272f924e68c3a4e5ded1f513146da2706469118b24a40e11235372b21d3. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/ES5238600998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc69df77fc4f148c4533b42314d395a6efec153f0091c388933fbc9eb19f7460. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/ES5238600999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72d849bf20a1d29fae7a5642a89e79c91606d38006ce4e38bb0834381dfe265. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/ES5238601000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764c8d61fee231cbbb774fc0407f440f1c7e60e0b355352a73dbfd699b8353aa. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES5238601001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e83b19f3ee37e835b2267a036909ceb982bdac5b919766427703a723a8e700d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/ES5238601002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9658c91555b90b8e31c35457f7aba92b35a2ad1691e776d4431deb55648fae. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES5238601003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234dc25a49b61731e85f47732f0c4656aec36503cd93dfa4c99e5dcd522a63a4. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/ES5238601004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af54d73752071964e4c025c06b3b69d7e788f27c56bbaf50379bca6640bd3ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES5238601005.
Rosa de Sant Jordi : Les Sardanes Més Romàntiques
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa666d3bbef11300989909ad28673614cae781df4dbd066d0c92a78a3c252f85. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ES7581310243.
Sardanes d'Antoni Albors i Asins, Vol. III
Músiques del Carnaval de Vilanova i la Geltrú
Músics de Tortellà (II) - Manuel Saderra i Puigferrer
Sardanes d'Antoni Albors i Asins, Vol. IV
Tomás Gil i Membrado. Sardanes Dedicades. Vol. 10
Calonge: Sardanes de Ricard Viladesau - Vol. 1
Calonge: Sardanes de Ricard Viladesau - Vol. 2
Sardanes Dedicades (11). La Nissaga dels Martí
L'Aplec Pairal de Catalunya. Sardanes a Calella, Vol. II
Entre Ceps i Oliveres. Palau-Saverdera. Balcó de l'Empordà
Obra Completa Núm. 1 1936-1958 Manel Saderra - Vol. 1
Obra Completa Núm. 1 1936-1958 Manel Saderra - Vol. 2
Obra Completa Núm. 2 1959-1984 Manel Saderra - Vol. 1
Obra Completa Núm. 2 1959-1984 Manel Saderra - Vol. 2
La Simfònica De Cobla I Corda De Catalunya. Sardanes Per Al Món
Obra Completa Núm. 3 1985-1996 Manel Saderra - Vol. 2
Obra Completa Núm. 3 1985-1996 Manel Saderra - Vol. 1
Camins de Somnis. Sardanes de Joan Lázaro