thumb|Eva Madsen on being elected mayor in 1950 Eva Marie Madsen née Braae (1884–1972) was a Danish municipal politician. She became Denmark's first female mayor in January 1950 when she was elected M
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 0xeacc42123f056c9f3bc5c759674683cecf89273cfd6bdea99f04e323cf25a726. 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/65988f39-be6d-43fe-b02b-d795f07a618b.json and https://artists.proofprofile.net/proofs/artist/65988f39-be6d-43fe-b02b-d795f07a618b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Alle Tiders - Clausen & Petersen med Eva Madsen - Mormors Kolonihavehus
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 0xff4c0d0a7166d19222c8da0e7c1af496888fca18a6f941969b9ee44a4a0a7415. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DKUM70600345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809cc9a3941535f3d39577cf45738372e6dc7c7fdcca6d2ddec38648a25c0244. 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/DKUM70600346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4593a62cac23d16afc0b4f36c3ef6d1468d933024363f08848abc89d050535f1. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DKBKA0300639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f001f7cf5137cd6026bdd9e82bd7d69b8dc7a2d48c9ca43c97b6f74d08d6064. 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/DKBKA0300629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71bff0d888e357869e65a1a2f936b12924508e8bb43afcb94d27eff74ce7498. 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/DK4ZA0300301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70f69c16f3cd860a26579ab4f9ec4979732a20a5e25c15f20a76c83b7272f9b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DK4ZA0300312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69910cd1d4e3c68ff676cf3706feac5afea4709a92a535c9f447d9bc8017569. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DKABA1100915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4593a62cac23d16afc0b4f36c3ef6d1468d933024363f08848abc89d050535f1. 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/DKBKA0300639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f001f7cf5137cd6026bdd9e82bd7d69b8dc7a2d48c9ca43c97b6f74d08d6064. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DKBKA0300629.