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 0xa6545336bd6ef4a82e4b833dcad14dfe648565375111bd172f1f88c1354b8ea0. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/feab7904-7d25-4ae4-b8a5-2a6e1fb8b983.json and https://artists.proofprofile.net/proofs/artist/feab7904-7d25-4ae4-b8a5-2a6e1fb8b983.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 0xf12c1fffe887df46b0fe90ec953e3849257c2d73440d71f38cfebbfe43b2f80d. 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/QZES82369973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b01434d10e02a5e8a0fbab7efa6104694f4e16f24ce0353de0fcbcbd9d858fe. 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/QZES82369974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b4005ae51e0aea3472290d32bcbad1863916352a9b0aef40f18a9fa67651d9. 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/QZES82369975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18caf0601f54b9e54dfda6d5dd895acc485b2985f93743700a9d4fd13c3eba2. 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/QZES82369976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2ecfd7a95a0470aa6c44304cac23099acfc721faabbf5054fbaba7fcca8b46. 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/QZES82369977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744cc5d6453e42a2573a58c0307abb7bd6b09ab9c3b81d95c7a191c01a307745. 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/QZES82369978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326f921dd836fc217a6dfad2fe9f697556bfb2901db47b10d80fcbbea08358d9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZES82369979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43271ade852766e4286494230616e3402dc4ea3009deaf8085747b49d29cd9b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZTB32408318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0e1c9f0f37982bda2889c72e661f31cae85fa6a69e1a381f987e3d99045c24. 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/QZNWY2453624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e9c571974f2e089270a5ee4d83362db8a3c4da066dd8a41f8bb45e06b84fa7. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZES92448899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff65da77af9f5fc3cbb30a407bc891b45b1aafa17fff3e9d6bba9d149a85de2. 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/QZTBE2388465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d45f7262de16f2c9e0a92121216d4a6307ba98268bb2772e39b8e71e47c9479. 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/QZTBD2377779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9951d37df4618c48d305c37743546212f7b8fe603fccba22cbaddefdac9647f. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZTAW2305661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb732e00cccaf8c90190621747277dfeb9cef13643ae93872e456086658e97038. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZPLR2393753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e43610f6370633860c38a9d889805a4a11fb97cbbb2965dea2b90c4ae30fd4. 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/QZNWU2343595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2b30772f6dd1fd5bd15ddad813f90043ecbe9cc4ee9047b1a427e4fe0b8008. 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/QZNWT2324261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681f2cbb5df2461aff674054e053a905963dbbd49d4743cbaab3d7b4805b67da. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZNWT2324905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bc91fc692a6fbdf1ea56c65d6e32c0fabf87ce4b02c44483099bea7c539db3. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZNWR2397622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98a62032ee0b0c3255cb0f9918e0b08f053377e47e896ad9768bbf56beddd19. 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/QZMER2395160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634857943529ee20cb2713da4072f46b26208bf7f15690a853a00dc6b8c995b6. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZMEQ2374927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6000ae4e2b8993ef24702166517fe5a85da86d42cdc15f1a8854c70a82624143. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZMEN2324026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec088a68253b37bb599fe70bba15d6458251a6e089a65a88df45937ed9c0f0f5. 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/QZHNC2384106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5ef99896ba80d0107bb587704e097863a5c61d8b900aff0dbffe386e489acb. 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/QZHN82351098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d6a7cf48b3000576dc41b1ed3c14d4d0afaf3ff7fed2b66a50ca2cd555f957. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHN62358925.