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 0x6cb91159e7e521a908741467cb054a6d3cd90f24fa82a374f49e87e19745d2fc. 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/f751be80-10e7-4fad-b0b3-eeffb01809a7.json and https://artists.proofprofile.net/proofs/artist/f751be80-10e7-4fad-b0b3-eeffb01809a7.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 0xcd80d3160103072f7e3f617b29e5db6506ce3957ee98747bc242c51f7df81ca7. 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/BEB682300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9772bd0c13ef4d6f9b36de75e81a0faa2189678afec4c23f83b33c899ab08ae2. 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/GBLV61905203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4453db4476308c3a7a91d7dbdd367c2ae51a641643bfde41911d85660bdcf9. 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/GBKQU2441397.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370c5863fd5ee1493895559a11c23d730ee4bc55b47985d9e343643d18339936. 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/BEB682400342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39bfac7b5e478e09c9b63dcc761d3e75ee79522d3818cee20ece30c6e64eab2. 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/GBLV62108607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16636ae70dbab0c718a2b3875250bd0ae186ff544c57cf455b65031bb8b98827. 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/GBLV62108606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c260d6033c80f659acc4d838cb37233dc322853812311cf6caa6cc7031b049. 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/GBKQU2066809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7fd8cdf3c74e49caf733e7806f5081874cbe09abc42b88cbf356e58e3d43ef. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBLV62208639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf65db6ab7a427e44ba1128156853c79539b42eaf9627610720795c928bce09. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBKQU2352441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb08552267b59a244a9d19755e81dc6dc67d7d80eeeccd608427a3ee61deb9d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBKQU2327876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0c8c141fb586f812a98f216f729f0424bec2da42f7cc240959390c6747d6e2. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBKQU2432371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd368221616626a5c27eb44c49791bd9285f1e5b6eb868f6004c6ef90db2dd666. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBKQU2257641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c260d6033c80f659acc4d838cb37233dc322853812311cf6caa6cc7031b049. 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/GBKQU2066809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163e13f91d7594311a7b3b4d6dbf947e1e7fcf604c579f50578e59ed471985fa. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZRP42340430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39bfac7b5e478e09c9b63dcc761d3e75ee79522d3818cee20ece30c6e64eab2. 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/GBLV62108607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b43b9be251b45bc6dc85b85f2c6e3c0d1d325e2c19cda4d6a903e96985aa09. 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/GBLV62311992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37111277c0c712830b0bbb068d351a242332fb4f9c8ad57bb8bfd592f5fa869. 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/GBLV62126474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd368221616626a5c27eb44c49791bd9285f1e5b6eb868f6004c6ef90db2dd666. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBKQU2257641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78738bfb0440f3f153779fa93452bde98b27e8aac8a749cb23ed3390ed45e378. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBKQU2138639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cd3cc586afdcd4618f2b66c29a161238f00600b6941d15c84760bf02aa948c. 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/GBKQU1866995.