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 0x87447e6619d6b5943a2202a0ddd64aa3f158651b99edf284c565ba8437c4727f. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7b1aa37-bc97-41d4-aad3-369eddb87d16.json and https://artists.proofprofile.net/proofs/artist/a7b1aa37-bc97-41d4-aad3-369eddb87d16.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vandring i skoven (Arr. B. Holten for Choir)
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 0xf0508240080bd0048c161371436a39c39238224d90b741ca97fd6d5b47764467. 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/DKHJ61800201.
20 Folkelige melodier, FS 95: No. 19, Nu lyser løv i lunde (Arr. B. Holten for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9f7da2bdf691ff66ad61b46e78243f16d5dd13c6f42171aa770405495e2789. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DKHJ61800202.
Det er i dag et vejr (Arr. B. Holten for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f82476e515767d4935022965f6d69c9b96c7e0e1a0e3ab7583b71f086dc6763. 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/DKHJ61800203.
Den blå anemone (Arr. H. Metz for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04aaae5ab8daa6f728845899ccfd7dfc0c3613318b8fd470eacccd421e75f8b. 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/DKHJ61800204.
Den kedsom vinter (Arr. B. Holten for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c17a459834ecf390f3fa71ae94767c2cd51c71e2ca8002eb5953dba251286b8. 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/DKHJ61800205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a4db87ffa49f4928b7d881596241776c5ac00faec1273164bbc1f43a463ff5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DKHJ61800206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f3ac5174992663fc807d88807b772a617fa2a1e79d09b830d4f60dc616b5a5. 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/DKHJ61800207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e28437a41c1dc2ab390d039e51b412fc0a56ea1c54457cb888f8b6a49478a21. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DKHJ61800208.
En yndig og frydefuld sommertid "Kærlighedsrosen" (Arr. J. Jersild for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bbfeedda66ac65a3acb8d35b55fbd2dc2e41e062749f8ff760ff5ff0169046. 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/DKHJ61800209.
En snes danske viser, Vol. 2, FS 78: Se dig ud en sommerdag (Arr. B. Holten for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ccfb12f950034282595497f741cd49c0e5aa2d901a947ef13fac42574ffff0. 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/DKHJ61800210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e52c30fb58151b831aa653cd73bacf9af7eabc3f4c1852e3deaefead826a0ef. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DKHJ61800211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b966656bb1bc81e4a12198c269e47c833b117d4fb649c91727eb9c427da93e6. 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/DKHJ61800212.
Hvor smiler fager den danske kyst (Arr. for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13dac2647cee93628ebb9d06da97236b6fb47a20bb8909d3350bd58087891cf4. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DKHJ61800213.
Danmark, nu blunder den lyse nat (Arr. for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3029ae73f5799c284de3a09ece6c81ca436c4a156f2adb22779928aa9ecd7b54. 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/DKHJ61800215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e49d96fe259df0cf844e8338ca73fd891c6d0712ed4967083f6fe14ab2cff8. 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/DKHJ61800216.
Septembers himmel er så blå (Arr. B. Holten for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1074c76a32d579899cb5a29f11d485463558c77450df903c59db9057d55f37b. 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/DKHJ61800219.
Sig nærmer tiden (Arr. B. Holten for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3c4609d3b82eee9c2f938b88eae76fb6e42490d7b4381ad976a0e0888fa939. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DKHJ61800221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1ce63b416d2b72dea292e0bb3108dce85656ba239ce01cd28b02e768e9ff36. 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/DKHJ61800222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d566cd9dd355e3da62b2c27956c5e30c51c7ebc774c94ef1353fbb52d2a81e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DKHJ61800224.
Der er ingenting i verden så stille som sne (Arr. for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555e059ae277e6b1115734c15501745147f5137aa7c4bd438e65c3c457cb1507. 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/DKHJ61800228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f713c062140d27b4a9272a247352a1f8a24aa25a89f7ece11d8b6888ccec5ad. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/DKHJ61500104.