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 0xa34eb531fa11c2aee27a3c90454f004d5838983c0ce3237dc77a717dd5215184. 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/1734b28d-b45a-4a7a-8e3f-09564d909b81.json and https://artists.proofprofile.net/proofs/artist/1734b28d-b45a-4a7a-8e3f-09564d909b81.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 0x2dcafcd9341f126344ff764ee54a263699e0638b69835934fb505a1169fbbc24. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM42K1968565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f77fe5fd3396097bddf47da73debdae412285d3b433b9a4269e95352566905. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU1665325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9ebeeb40bac0858c258a3dd3662d957251f8687c3f625f8aa68323dd47c08f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU1665326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd428704b99b345a3e0923ebeba4185ed136cedf6e5c71d7ce0dad45abf3d6de8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEGA21702298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9276f201d1446c4717297b1b1d39c866caccb909b87146e8af800f5bb44f95a4. 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/DEGA21702299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9642a776a2f900a44fe500bf84cd652ebe57efb79109fa6c4aef4b38a7cabda. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM42K1710356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d09da749b0ff765a8a576b4bb2d263b1c99846fcad9dfdc3dc951447810ba8. 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/GBKQU2155144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a083d834ac050eebbaab9132d164948a754fc93f2d1f3e44ec2c134ee58ff5e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2258320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d09da749b0ff765a8a576b4bb2d263b1c99846fcad9dfdc3dc951447810ba8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU2155144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a6f3b36c0e19dc9808bd014d747f41214373928d700ba7e64e0ec133aaf109. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBKQU2258321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1add90ff9c09e89190053bfaa807cfde1243975d78e640929a6f5a00c1471f58. 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/GBKQU2258322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3645004fb42248c5b6c9b2f6d5780dff397a7cc55cd1a8aa8064213d3bca2c08. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2258323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebb90e9c87d504059f59ad6507faaa0821e9ec09d0c79e7639a94d74aafaf92. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2258324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0497e8a26983daa1217a86e605967f76bef73ee054481a6f7f65ed24a1c4fe9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2258325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3367df72a02af25785687fff0b1f3fada3afe7fbd7b977f329e65ab9d1d30411. 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/GBKQU2258326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda53dc7569741e5b306987ca6a0b00cb690a13f5a80c6976a2799f3697f16508. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GBKQU2296723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1f4b923abf8e576dd0b4c7d35302c3bcd5bfec2bdbb1c39a5d27e4a4f90259. 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/GBLV61611895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319a6983a56b9d02589cda3a44661ea167afcd20273c25f393bdedc10be81b53. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2376473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5676f48132083e937f417ad34b9c519c9e6de29b8b128123704e593d765233b3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU1902370.