thumb|upright=0.7|Madog. Book illustration by A.S. Boyd, 1909. In Welsh folklore, Madoc ab Owain Gwynedd (also spelled Madog) was a Welsh prince who sailed to the Americas in 1170, over 300 years bef
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 0x41232dc3a894b4b108999275a19086f1f21ae326cda9127b51612f2eb554dff2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c148f6bd-c632-411c-84e6-3dd11f608e23.json and https://artists.proofprofile.net/proofs/artist/c148f6bd-c632-411c-84e6-3dd11f608e23.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a84871c22a9d6fbcc45912aa222709888417ad1b4ad814bfc0c3bfc660530b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGJ1932045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76dff77f0c4215b59c6639b9fc45c109102c5634ca0e3003a81d18ba572a8494. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZNWV2172890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135e878809c6fcd8cd9304ee6d4127f49e9cecb2294a15b627b13615635a1ac6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWV2172894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b3eb5d9fa98e91fe6adbc57127e2cb266881a6c723c0614aea9166aae523d9. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWV2172895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a6a61c2ed823bb0702ac46795d68c8e4bf866290b876c8550238ea2b83a0aa. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZNWV2172896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d631ae5f5ee266266c8120992fc752e807436f49e5edabdce63cfe70a538d9. 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/QZRP52194360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd491fa424c5db2fd0e935408e29abbd306f37b820489301f6b39934c22da0f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZRP52136099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b735c82afeb6d59b0547b7603317ca9c03ec9a5e0d73336dc641ef9339bfc5. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZHNC2230522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200d2395d61465491e365dcc19b11b6ceb38d47fd05245b97d01f9beb405a3e2. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZNWV2274237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e41288f7ea14320723e6a63809bcd13f350c0312750a699cf6390a428bce3e. 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/NL5MF2101208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efa40abc2d15c6b1dba784b77d56ada40c24b64e036c0557c87eb9a912b0cef. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWY2392662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5aff0afe6c671d243d66de3db2ad1713decc48f2fe94e19d49490e81761965. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-19T23:51:20Z), 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/QZNWW2459262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2813148b9862927c5d8fea46bd236faaf4b143b9863bbb7cbe3fa4ce874bbec3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFU2479168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd01e4a37717ddc5e023e535bc9098bec08659030162bf421084517d22b2f65. 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/QZDA82591109.