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 0xcf2213aae53b6d4cb392d4b320f7429600a0bf39fde2bebb38d367669dc60331. 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/8ac9d9d1-b6ed-49b4-b90f-485c242192cb.json and https://artists.proofprofile.net/proofs/artist/8ac9d9d1-b6ed-49b4-b90f-485c242192cb.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 0x21bc088372ab28726cad880f8da84dd95e00de2fdfc4c39b94f475becc4c6039. 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/QM6P42351186.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89349a99f11077d143751a056b418298a6b0c9fdac747a3f31d24ec61e191c7f. 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/DEZ651703778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe17f1f0b3184ae6e1e02e418478b5276c6b042c8324a3cd90d20582f8d0cbb. 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/DEZ651356208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0bc392e6d88c02d482c16ae46427da25508b1194f5d5fbb75903730eba7125. 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/QM6P42351185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4f4947e13b2b6591ddf7c9218d2e9660d9a4b9f6696c4ab39c6eebbf9e957a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM4TX2262283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a963ab236dc4a87487e71893834fcdcb3d624e617e2ba4fbd7151d82ae8cc46. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM4TX2392828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a45f14338c7fbd475df6fca1791c7291ed9774e08bee33bd15836ef38d244ec. 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/QM6P42363007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08bd5cf90d2df9db6d92bf003aa9e5115e2f300f60f449b6b5ab6776142bac4. 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/QM4TW2456462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9067e9a446c6dd612a1d5b68fb187ffda5454b1a113051c5ac8f589bd974e3. 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/QM4TW2474252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f2215a4bc1eced246734278446bc4c047042f6762c5ef5840580caac02a5e6. 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/QM4TW2476932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50424a0b3eddfaee8dfbc6b17454ce9f849fc583218640dcaf93dab49db3457. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM4TW2476933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fc42ddd93da9ae769b0a663ecde0d9b673ed7008113deb0e3b38bed39a3e87. 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/QM4TW2476934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaca8cf5a439c83b8158b653f07000714ca3a7df581e61c6852d021532a0a801. 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/QM4TW2476935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316a61bd2501a7384a24c72ed536b9bc18d3d77e302d2d0d335a040018d316d8. 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/QM4TW2477395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf671db54f7c302474e6fb1d6546bafff05ab1743bda0005b0f0b4734b2824cb5. 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/QM4TW2477396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fc11b970f700b9b7fd8ebc68f6d4bebb6694e31669e6d25d699e855710b62c. 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/QM4TW2476174.