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 0x27ad0eb4a4760eca1de4a6b976cb91b2acf1a046caf64910478c4f92eaa8b14c. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f17acc13-fdba-4b5b-9043-e8b1a33da618.json and https://artists.proofprofile.net/proofs/artist/f17acc13-fdba-4b5b-9043-e8b1a33da618.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 0x5e309de4015c07c08c7d0cf22ddab9ee18e5b632decf44c08b67e5fd6306ee1b. 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/QZBJN2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5291377585ec09c96fdf55262b4ee0496f4343cf1cec94642f2bb264d288ecb. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZBJN2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca16354486fa6573088739b8c035f2732bcf4fd37dd59d5edd47706643f3184. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZBJN2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ee825917d851831cfeb1ae49c4b65f293004c4262c7c91c2089a4c6c458e96. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZBJN2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e70b0d2c277046d30f4b78b7788096a1faa46baa6ffea2e13c5333c4eeb148. 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/QZBJN2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7f4cabbd4361d46a8263a6e0a0276192ec3bff6840b579b08e0466ae7695e9. 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/QZBJN2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbf55b9b9133ae7110a2b317a5e4a73b34bcb9759d33dc073367372e6c320ec. 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/QZBJN2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4a4a62e1f61c0d0925b918890cbfd534223ec95d123b9d8e470dc848daafa5. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZBJN2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51603813776e8a0f9f2c73b99c095b625d826b885471b42c13020a7fab13130. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZFZ42479083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9bf3059fc68addeba09a3dd9af13057ee7e0de6c8dac8f6ba9b1429a168654b. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZBJN2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc701ad35bad6e753ff9d06cab067ce32c388c8cfc2e629bd9871d4c04ff8a0b6. 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/QZBJN1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcedfcbcf52089418cce66bfc7400f44f206eb047274f905c58aa926b8cf04ac. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZBJN1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fd04385757fa55218bb6bcfb073807353e9b995c6ab8bd90c01843590c2719. 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/QZBJN2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6e4f11c71de3fbfbfdeff73ce5686e05b0cf2b90a47b57298c41e14806a60b. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZBJN2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aeff0536d259f11b7c46516c77178f029afab0a4aab8d32d659155303d992c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZBJN1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7f4cabbd4361d46a8263a6e0a0276192ec3bff6840b579b08e0466ae7695e9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZBJN2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e309de4015c07c08c7d0cf22ddab9ee18e5b632decf44c08b67e5fd6306ee1b. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZBJN2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfb964d4d497ed9ad0750e278c17e0357c3020e729d770c9cf261538de94d97. 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/FR9Z62100148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e2b64158b489783e168c9dbda53feb019ac1648650e657b58cbf192dc91a73. 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/FR9Z62100149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9644fc17416f0ae7da9f60d3944b0d114bbd4df85fb084905bbe53e6d49ca06e. 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/FR9Z62100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91754388667efeea563f531544fea65045bcf9a138ad0684a4fe42e0c6656645. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FR9Z62100151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9eaadafa059c7b2ffbe938ede7cf7790c01be477aabae212b71bf80a4add86. 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/FR9Z62100152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9eaadafa059c7b2ffbe938ede7cf7790c01be477aabae212b71bf80a4add86. 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/FR9Z62100152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfb964d4d497ed9ad0750e278c17e0357c3020e729d770c9cf261538de94d97. 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/FR9Z62100148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9644fc17416f0ae7da9f60d3944b0d114bbd4df85fb084905bbe53e6d49ca06e. 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/FR9Z62100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc701ad35bad6e753ff9d06cab067ce32c388c8cfc2e629bd9871d4c04ff8a0b6. 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/QZBJN1900002.