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 0x55dc0d2f6513846a0f13469ee1fad019dd72f226f9744f3aee216b94bb54eedc. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49d6bfe6-c163-43f1-b2a3-86430b0c332e.json and https://artists.proofprofile.net/proofs/artist/49d6bfe6-c163-43f1-b2a3-86430b0c332e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
De Dwaas Zegt in Zijn Hart: Er Is Geen God
Koor voor Nieuwe Nederlandse Religieuze Muziek
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 0xbcb7b3c6ec2e1a135dd31082938ceb016d536db77e2ef20622975eb3f108c246. 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/NLC351749020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d80f4a054f8311d03aee711fba7eb8ec809d8a171e73c5e871d6bd17a6c29c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLC350843499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319f17ac2eea58b10b975ba4dd97d721a3a7ab835d8a075eb287c4f229b40cc0. 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/NLC350843488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fe4274027a54834cb55c006624ce889821aa71a413025e09907ed8e55c079d. 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/NLC351046926.
Koor van de Amsterdamse Studentenekklesia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd730e3b9c07ae76baa24ea38a1c56804f95278d9c73eba37baefb67327f1485c. 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/NLC350843406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf235bd01a28bb5ee32bd98e46ac207dfcd0cbb19640a61e46148146bd107d155. 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/NLC351046628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d7d7f913077bd41c542d689d37da935aa279f94568bf4d61f01ac46563497d. 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/NLC351046634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8f81bed0276ca9c69f0298170a2cad9c30ab25547f694cecef6bf77f4cf3bf. 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/NLC351046605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263e8f75951b9cea96342103890ea3b63ead7b8d710acc480da773f5b773b7a3. 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/NLC351046609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcec1eebfbdc11d2a75322724a2b82f1377b0f132ba381829c3d706bc9e18578. 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/NLC351046612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0783b898c466002454fa6e69a0e8faba580725c6e2d886ea2370971f2975c9e. 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/NLC350843419.
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 0x52a5306adfda8f06cb1f7f886c67cbb360ca02fce5699ff234212d3d9c4e5331. 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/NLC351046650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274475cacaeff8430b326a8acb8ae44ba7c91a2b2cb6a8b8191e20c5dc171574. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLC350843483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836234d274837718165bd2e326921e5ab955fdc96dede89c6c9b79cd01abd0f8. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/NLC350843478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6c464780b3ab6d70bbf1795270fa41348fe8ef79bd8d6dc34b3c751d5f833d. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NLC350843496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55a976865fa8015051582f65a640973cc358c245cb3ccd9df4f4d8ae075c9b1. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLC350843408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f715be9374b7dfe0935d8a432dd3384bf50e7c06e0260501c0a310b003e59c. 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/NLC351046626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1105fc2348415517a75d3b9213ea8ef9f22777b1069161aace53446759dddef0. 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/NLC351046629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fa35fa70a4d1d11ad54c324b3ad34ddfb87be6d712e1829f714efb8bddb9bc. 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/NLC351046617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29f659c9cbef606680f8a2a676f67174a7f628537d98e2f3330b310dac91db6. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/NLC350843482.