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 0x30544c6470ae76f2c1dd6110344e4a8bdaccb77821aa3e719c7e7bfc4d94196c. 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/c41e6983-cec0-4d82-b82c-6a6f1deaab0c.json and https://artists.proofprofile.net/proofs/artist/c41e6983-cec0-4d82-b82c-6a6f1deaab0c.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 0xc66e23312e3a0f16cc5ce4834b465dfb936445c3f96f4151c32852ad7971caec. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ESA011722812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf69650e723497de1f1370b63b196241f46ddde3ecaf385eb6cd5e3145fcbb8b. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES5591300330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82d650cc3767182171a2d5af8b559d378f3600bce083d679999c3e35aa61d6d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ES5591300334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fab3d24774315c32113b3e4c0646f9bb9199e8e3466a37d33cfda2d380dc40. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/ES5591300335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702fbbd9526a3ee0056a98ef07b828672422dd71926914dd16731db18f1c524b. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/ES5591300336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c2762e34094662c65cbf31d56e21e9248e3b484112a92db0111b774406cae2. 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/ES5591300337.
Elkar Estudioa Sesioak - Izaki Gardenak (Zuzenean)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb64bd0409db694a3e05be42ab781c398a9baf4c1ca7c73deb95898c746ed6f8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ES5591500386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f37419fdfcd25dc6f1fd3cf065b503a40cf527b687056c72396535d2b8f15fc. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/ES5591500389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6861ce81d7844110c53931d115ecfdb8f6b482589eabbc3a8d89d31337307d. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/ES5591500390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1846b9f1493de7fea8fadd02aba77436222d72f284263492e591f94a90901f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES5591500391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f63b686784c9b308ae6a2ea6797a8a03cab3164006ad59fdb1614215b53364. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ES5591500392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c4e6ee20fdf43bc00b29bc64caa31c2a62aef636d11a933332bde65d2d94b5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES5591600357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c93836b63b3afa877ddbed0d554793aafacf14aca6269df92dd73e4bb790dca. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ES5591600358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc79b3c8c93c387624c37fa4c951bad89136949c93a36a1f54e132942291de37. 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/ESA011818981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b376af1936bf394fea1a411c283945aa0b23ceb428ef7782870dd1bde5885a. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/ESA011818982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf84b26f78e7c142ccd6d3f2e7e12e1e3fef1837b89dcd5301f914c327240268. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/ESA011818983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820efcec08338afb2c726631b2f55b18626569ba3fa697522554a286fa35a180. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/ESA011818984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09b901a0da613791885934c6e48765dbc64aaa00b9728da1f1b85c686dcb7b6. 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/ESA011818985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3793d3ad1ad5c0ed14d41218915843a49e3160f0f61e4b68afd542b223fb7229. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMARG2050290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b1fbceb23c51d82685b8f42fa673d55174427de94a78d865befaa3b9d690d4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ESA092409520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253c05a891aadb6629f04fb5c0441b5d7905cafcc0079af37a74fdb7b0934f6c. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/ESA092409522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770336790d7d91f989bd2b4a34a4081b18a599afa67f2f099240719052aaf7f4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ESA092409523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6bdb32a547269a85b4d389834af6429e2d60933248a1caa40e65b7074b6e31. 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/ESA092409524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0570bb447ee19a5b95fa079134a0487aca44f2190061c2860a49a42f74d02b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/ESA092409525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b0baba978a53575aabb78b73db7c3d4de9d7dc9f4ab1ed7493ef72c9ec35a0. 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/ES5591800265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f3fa09eebeb0e9f37f2c218e8e9df446ca30095702148a86c120d80d416db4. 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/QM6MZ2585632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb726309f22c0b6fcff251e8ba37fb1a719878d3a670277f20b627f21190a5e63. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/ESA012557392.