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 0x9128a3ac7ed8b58952b1336917bb00472a5e390f6670625f163a9495f5c8ea6f. 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/e8a0b1bb-1bf0-493c-9ba3-aa52ec8afde0.json and https://artists.proofprofile.net/proofs/artist/e8a0b1bb-1bf0-493c-9ba3-aa52ec8afde0.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 0x27a4bf0b800d34179f1e6d2259253c077a963a66c053a69f34f7c5fee485e9f6. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZ93L2053233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a4bf0b800d34179f1e6d2259253c077a963a66c053a69f34f7c5fee485e9f6. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZ93L2053233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd75c2d0204e351c9b0758a3f509c7191f581ba3ca58c22fbb74d11be8a2898. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZ93L2102229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd75c2d0204e351c9b0758a3f509c7191f581ba3ca58c22fbb74d11be8a2898. 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/QZ93L2102229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90aff43dc7d3b04ff60cd46e4d423b8c5f546405d57164149069d72cc8fe7451. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZ93L2117321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90aff43dc7d3b04ff60cd46e4d423b8c5f546405d57164149069d72cc8fe7451. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZ93L2117321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd305ad3392fc95b19894fa3cbc22e5d2e4ef577da5592dcd1a2f87f10633fab3. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZ93L2132870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd838e24b65a9a6f8deb5d5df665c89c3619b2b46fd8f224a43fc35e7734d5d9f. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZAKB2170225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b70dbac0704da5cde31d15ea80fac0c3e202a7a1d1b23039935fd5de1b9f991. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZAKB2302667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b70dbac0704da5cde31d15ea80fac0c3e202a7a1d1b23039935fd5de1b9f991. 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/QZAKB2302667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b30e514d7e1a468af93cb53c6cec090a760111bac5b255a32a97229819a079. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZAKB2316418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea02f54e4f41e8d54d6ef89b6f55d950cfd3895fa6ab773bbe379cfb3735abe. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZAKB2322535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75146a94a365844b0b82bec5fab76a104c01dd4075b189ba1a3d11b8e0722e8d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QMBZ92347938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edc07e2d270002cc0dffa31f131d72728cb471f90d59808af29be9e1ef4ee62. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTB52351963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edc07e2d270002cc0dffa31f131d72728cb471f90d59808af29be9e1ef4ee62. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTB52351963.