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 0xed077bdd1680fa5251d4598443083b7b2a3c95bbe1ad4a3b93d8b35d23fc5071. 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/e914a0dd-494a-4977-ad98-e942fd82f746.json and https://artists.proofprofile.net/proofs/artist/e914a0dd-494a-4977-ad98-e942fd82f746.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Christelijk Mannenkoor Soli Deo Gloria Urk
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 0x6f1dcf6274df8f18fd7149f6fd5c6bdbf8f88484cfbc6e5883a6a9e66a838103. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLCQ60446601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46c15ce9b9a3dc79692b35555baad911d1fbff875911f2f2c9400ba7d97afbb. 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/NLCQ60446602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51de51a0c26cc18f3957196b4586e32e79da07ed9a108f6814aa794e2a1223c. 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/NLCQ60446603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1934d09927eb43bb5da9b10498c8904beaa3a4304439a7f8beafce74eeeeeba. 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/NLCQ60446604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecb267523cda41f3da134d6945e07404ba3896344995b8ed70398fcc9aafa49. 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/NLCQ60446605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67d3b5ef306944af0dd728b4254a39885e26401c51b354588def607c1de6250. 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/NLCQ60446606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5717d31efd7361433b86734c76fab2a515674487c3675a6354eaf2fc3fb795. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLCQ60446607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdb7c9e5095f9dcd52318f6c17c40d6da1705ed21ceefe5b62c946584b89271. 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/NLCQ60446608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f3bade005e4ad5a455dcd0e4214694fd38323deb59f34e23a7d5e6f6064d8e. 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/NLCQ60446609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e7f425e1ca3845789d82b953edcc57600254cff873f1d46af791cbe7b31db3. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/NLCQ60446610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac365095c9c4d7e4f048629332b3bac21137ce0603c3f76a69ebbc35d88cca2a. 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/NLCQ60446611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0798ceb4cc37ea9cc9b32caef433bfc852e39a5758bda35879e4fef8b2281de. 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/NLCQ60446612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508cff5fb72fb7a4e234bada8aa4f0458c8032ed9d46b266c8712d7ab38c8a18. 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/NLCQ60446613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179eb1e35fca12cbb4a4cf5522548f9b40fad2ffdf80421a067e24393c9edd78. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLCQ60446614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166f605a204436a78f82af1e474af0d7980d6632b1f677630f96f6b7ddb1e6e8. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/NLCQ60446615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e1106aa2392aa37aceae92d3799e6033665c6e4bb041c3dcebc6419cf09c4d. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLCQ60446616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab36b2f3dda593c1015467879a25e0cf7a4da53048bba2055f93edf4df722e23. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLCQ60446617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbda4299335a9fa26d26183c7d323161d5a8122730fa6dbca43cbe2a5ade3efc. 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/NLCQ60446618.
Op Vleugels Gedragen: Instrumentale klanken ter Bemoediging
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48e1a4c61b0259948dd6d48a4f0810bb1adae6c3e0a7dc93dc04f668e8176d0. 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/QMBZ91612812.