thumb|Felix Meyer biography with portrait in Jean-Baptiste Descamps' Tome Troisieme, 1760 thumb|Grindelwald glaciers by Felix Meyer, Kunstmuseum Winterthur, 1700 thumb|Mountain landscape with lake Fel
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 0x130949ec8d700b52de90c66e80c63fd860390d1318a8ce57f4ce07b882952410. 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/942a89bc-ec30-44d4-99d9-bd28378a96a4.json and https://artists.proofprofile.net/proofs/artist/942a89bc-ec30-44d4-99d9-bd28378a96a4.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 0x74f4c1e961f2c3b11ff42a8b17d2ce4460dcfd4b0230d52fb718f72897d48c06. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DENH41000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b75d55fb53eccc1e6578233adc57fca7175c664dc1e0cd4c7d3106cd7c9801. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/DENH41000070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759ae57e6e511ab7e3cf6df380513f70e1fa20f2745e9a8f8ddfc2d1e3d48481. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DENH41000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb5a90119005832a7aa28f40d4b3dbc2b5ac0420d397e0cd5e2069f720878d2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DENH41000110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29c468659b37197e9ef1e9a9f0e3ad2119fc4b76a13738544625249938a2e4f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEW471100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd399632268b3d5720e716185859182421ef9ec5f00d41ac62f3e34c8d9539bde. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DEW471100044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadafaf81747d43c023186c77091ee1c8592ae8766c8654654f1d99031325d06e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DEE121600102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c436246e4637e93316133d24c0c54ddf8445b4b5a1d8ca9b8daba82bf7cc0ad. 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/DEE121600104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c8d1674009b448ef80426a6d8b111ca3ef408d3b62a7b83058bff7caf9e18a. 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/DEA451902930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a9014c3f035b5f606412f0eb7ff994fce05a6c753faed80f9b345bae8ac20d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEA452202610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa84b494d7ccba5f381531941f3ffe218be2df8fe7daeba51429cf008f22dc63. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/DEA452202630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa2d572b082543ee277f85a40f7c4519e4f7d778c669caa2d1c38267a9fe598. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/DEA452202640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03654a33cce69b16458c058da87868815bdf829299d627e56e50ae5b8eb0ef1d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEA452202650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc87ef87caebae5d05ee5c93e70582c235a9902461d62eee281661cc9dabbb40. 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/DEA452202710.