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 0x48f84225ae95c566fd594e32eb562a14bd2354a501dd605447b88e2211f76570. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c661d76-709b-4d1f-a85e-522f5f680a31.json and https://artists.proofprofile.net/proofs/artist/3c661d76-709b-4d1f-a85e-522f5f680a31.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 0x5b355e10f5ed5984999bdac76d858e4e90c8352e51ade3ffb5aead897cdec22d. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:45:00Z), 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/NLAX79802793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572526f1e9e4793ccb3c9a681e0b8b8123d27aa339a35e535172e784c521ba0c. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/NLD441100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e01565c594d72b2a10e8994b4263f4c3a453742cb53b8ca285c9ae679416e1. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/NLD442000034.
Jan Douwe Kroeske presents: 2 Meter Sessions #1762 - Def P
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670c1c17f4fbc08afefd4cfabf5af2e6a2d96d6de739e2659c39b41cd5170792. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/NLD442500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81803c3c1c153bc901190aa0a20ce0b2990bb2d90719435b62b489f8904e7fee. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/NLD442500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda20cbf1e44b0e7a1cb266a139ac6b4ba2635022479f7ebe26fe3d3505de1ceb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLD442500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42610ed21438c2b85bc9023f8f3ab7c202fcfb77b8b62cc41ddcdc3b4df8a90a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLD442500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ea68c560185ed7815adf5507b3d23455d21f6410a6edddcf103b7f6c89fdd4. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLD442500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849aaceadadacd6ccb029079c9574750567b89636832218b59ba685b3a1c40a2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLD442500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd8410294367661543ac38e75bd42e266410cdb0430e3b87bba44672470f34d. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/NLD442500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b474bbde8f1bbee89fd5d823c725561c09b1ef03a38d1caa8d5443788cde54. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NLD442500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4235abfc0db6737ba91869c5c5cb1284e42beec568a8bbbc7cc9a23fc841eb70. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/NLD442500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d38983386af33a5b8cd8b8279a8236d3ebb8fcbc86f1d58218d28576bb8942d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLD442500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7170afc7a2daec85a7d2618cee86516e96f82febed0b16b1347fe95400bc7c9d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NLD442500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635d8cb989e29ec118c01941c8647caf00ee29d9841a3463eb1f0da72ef90655. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLD442500039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0877233a5f0a3c39f779f8d6eca5169b77d0a3a1c53aaaf383e3509811a5bdef. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:43:40Z), 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/NLD442500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85d6f7a714740f29f13340a3011ed6cded871dad538f1c8128770aea45e8178. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NLD442500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886d721701bf23f5f2279d8067e826187aa2844f9ae8011c461a671032b678ca. 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/USHM92005317.