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 0x83e5c8dea538b9394336d41ff6b6a0bf956c5e0e9a66cdf61588cb8059d34ed3. 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/1a52616a-d3ec-425c-a855-f27bb865f550.json and https://artists.proofprofile.net/proofs/artist/1a52616a-d3ec-425c-a855-f27bb865f550.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 0x74276bc85a6e487a40b032db192a273954ef9c0d5bc933bfc5afc265625ca374. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZNJW2519359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb77e28c0fa53261f3e454421e1297eb4e51ac4a34a7f5f880fffe65053ee4f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJW2519360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516ac0289c66b6899a4f93be1ff0315816231fa631220d83272c4815dc6cf0d8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES71G1721535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65cd2ff0d1de9941e2af1e6067e138154cf6f51b21260dc57e785cea2c71230. 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/ES71G1721537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89cae3d7e082bc8b5ecc3a91594188b5800070ebb3d674f3b3ea80bdc82ea3f. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ES71G1721540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82f952b96ea23bcf2d897c41827a7044da5ca573485c6548f7255594c45d62e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ES71G1721543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1faef3535ab229c7d9ad4b1223cc3a2079d91243cc83147c882443400e73557. 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/ES71G1721544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84f9ff882e2ee56145f7ac925c437d6560506d5d92958c06baf915f95c1a2dd. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/ES71G1721430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631e10cde5bffb780a2aeaac580c0768b4fc0932c6a18db9b086e4da4bcbf207. 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/ES71G1721432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545847cec2520e9af341da354e2278450abfaff88e8033136210f15c9830fcd4. 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/ES71G1721433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5420b8fbf67a9620f476a77234968bdaea3436238e88318aa7ca12ee2b4e42. 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/BK4DA2305883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee670dceff53a777a04c7c7082e897724591a02f59d8e1b33e942d5c08d3b192. 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/BK4DA2305884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9307cb4f63c5ee0e66b1cf8fc488692c0a13538749ac99c16f6a189603d1ed. 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/BK4DA2305885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3984f89fc698fdf3b5bc68a2c93f6b4d7f631716d4f910c4e1da54c88e0e81e5. 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/BK4DA2305886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e90c3275ef6b79aaa2d5ca323e87e5516069d5c7e5edd8aba046506e365e27. 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/BK4DA2305887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d37838dd81f999abea183818f92ffe63329021a99bdd62a891f768a85c7ce0. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/BK4DA2305888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67040ee6d423d5474dbd83454b19626a7911ea7cc4d5f1793786294587cef98. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/QZHZ62126918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4d677ca65f072fda535d5a1702d87fee919a7b9e68c64c5e83a0443ce72e1d. 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/QZGLM1958686.