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 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 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).
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 0xf0611c3786c223b3f58686b918ba38261c658254c123811afe736ecdcf0bfb66. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/DKATA2300504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7016c3358dbeafbda9bda01c713555e010744881ca2e0f39fd54d051159c2a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DKATA2300532.
Alle Tiders - Clausen & Petersen med Eva Madsen - Mormors Kolonihavehus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965168148ac9efa71212df88bc0ee3b8874a3368e13b09c71586945737fcfbad. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DKBKA0300634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4634a72f77519f16a703a4502846b5fd3e065b39fda85bc5da083ca3df75c3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKUM70600342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d620d3bd985da4fdbdb50020e0fd44e63446f70b0ae046b599acfdddd31e4d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DKBKA0300635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c3d1cb9574563d25cc2cab5c7366f66ae47f5cbf658c10af05acc70efd519b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DKUM70600343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61dbf495f2185b998d9ed955a0325fb7e58155fc43f6e000e8dfe52f9cb4858. 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/DKBKA0300637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd102af9af406eecb883829ac44aec4431005950bc08de28e90e589263d4e00ac. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DKBKA0300630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4c0d0a7166d19222c8da0e7c1af496888fca18a6f941969b9ee44a4a0a7415. 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/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 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/DKBKA0300639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a17d77333b19ea7a648beec4af1f64efcb0131868bd1b0d113870a7fb7760a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DKBKA0300631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f001f7cf5137cd6026bdd9e82bd7d69b8dc7a2d48c9ca43c97b6f74d08d6064. 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/DKBKA0300629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6727ad7498cc67c880dd37359b9302981ae3827cae0017b240d4593c821dc52a. 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/DKBKA0300636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12864862a834681d0aab2912ff02f819ca6173c2738038378d425a7883d7de08. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DKUM70600353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbd75c0f4ccfa2b0e5e185b713619e53b487c0ff02f30deca8b4cb6c18d868b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DKUM70600355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d775a5e8a6ce1a481e03796def669bfd1e94ccbee7749e79b775923318caf90. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DKUM70600357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71bff0d888e357869e65a1a2f936b12924508e8bb43afcb94d27eff74ce7498. 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/DK4ZA0300301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f8288531373f4e5e9e1010f358905968e91134036a1a870b84e97baa044f4c. 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/DK4ZA0300308.
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 0x9be62f42b7a11ec9175d63bac140e61f59a08415bb833ab17a5b53d99e0f5e3e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DKFVD9800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69910cd1d4e3c68ff676cf3706feac5afea4709a92a535c9f447d9bc8017569. 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/DKABA1100915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a94f0fcd8bd7ccae57a79e5f2593d487af18a25afa938ad8ca021222b2f639. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DKABA1100918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965168148ac9efa71212df88bc0ee3b8874a3368e13b09c71586945737fcfbad. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DKBKA0300634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd102af9af406eecb883829ac44aec4431005950bc08de28e90e589263d4e00ac. 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/DKBKA0300630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a17d77333b19ea7a648beec4af1f64efcb0131868bd1b0d113870a7fb7760a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DKBKA0300631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f001f7cf5137cd6026bdd9e82bd7d69b8dc7a2d48c9ca43c97b6f74d08d6064. 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/DKBKA0300629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6727ad7498cc67c880dd37359b9302981ae3827cae0017b240d4593c821dc52a. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/DKBKA0300636.