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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c70ea92e4c6de4118b0123efbae1767fd63872d77117aa49ff9b3af56a861f. 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/c7a4d10d-a7a0-428d-b098-aea47a2022cc.json and https://artists.proofprofile.net/proofs/artist/c7a4d10d-a7a0-428d-b098-aea47a2022cc.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380d8d09d502555a88d6db0b884c764c860c327e8927abfc0e9e318f9fe11045. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/TCAER2077681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ada9ff1ea72e111a5babd2239fff570eb2057344df319d0d84441d1e4aeb8e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAER2077686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2f1ea71294ae5e65eace8ea83ab8914054eb7b88da8867dd3dbec0ba0de06c. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCADY1858635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f9c357fa059ade4ddec3b65bc28d35d46664a33d5b4843fe777c2b5ee87ab2. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USUM71903073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7301d68f503819944bd12eb71aab2a6ba6628cbdd5cbbe200a434d8919e772f4. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/USUM71910934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02427d1dd936082bfb352cdcf8f4f2507b38f6cba54081dbef5823bf2fda56d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USUM71910936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2028473b9236097218ea5ef74f47beb2805457f80a69a8edd2af20d52dad47. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAFE2075238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718d09c8e9e0d46ef84a23650641cae74be3a4beccebf892e26e121f592cee13. 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/QZTGW2100253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe43dcefe01296ef1e26c105eec20309789fac9ae963a08ef23f78a2dbb43e52. 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/QZQAY2324906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504e9b9cad4a923d6ce9bcbaf6bc7d74262e50eeec97f9c091a19354aa59af57. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZQAY2472584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023e4b43b8bbab136aa7a4bfc0a1a859bc2321280ba477496ce73424a0e2d15a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZQAY2477519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe313a0d022a3e45357b356600f4270a6532c4050f395d4d97b35038f1de9662c. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZTLA2507767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e913788effe4fa2e6d313dd06b20cf5a6e16d6ab2cf9d1f1b3472a96558c3a4. 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/DGA052050914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270e73b022fde5436d42c4f3eb07a4b4e01d0c9f99557d917a5011d03f18c734. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USZ4V1900164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270e73b022fde5436d42c4f3eb07a4b4e01d0c9f99557d917a5011d03f18c734. 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/USZ4V1900164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f9c357fa059ade4ddec3b65bc28d35d46664a33d5b4843fe777c2b5ee87ab2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USUM71903073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfba3ecc5a8c453b9b3d0f2553e234fa1f4139a71e60afc3f169ed2e7dad831. 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/USZ4V2000229.
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