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 0xef4c442793210232f668a380e1bf77e12109e3f62399b29de99e9c5481fb35c4. Chain 2 (Bitcoin): anchored in block 953714 (2026-06-15T00:43:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8690a3a7-01bd-4df5-b8f6-5d8f29c272ac.json and https://artists.proofprofile.net/proofs/artist/8690a3a7-01bd-4df5-b8f6-5d8f29c272ac.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 0x052c9ddab05aa1106516df46556f385b958a1a1034de96a1f38d1c05aa411f8a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CH7812349525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec02ea48ae82341b9012cb996e8dfd8d2e7c58ee82b8c7b5ec069215ceb2f7ed. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/CH4132200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9fb7af87fc81fe0cc8c8cae468b54974c8f6c8a76597964704a4ef6e142897. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CH4132200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0692c7123b945f112b0b69c5a209c81063ce69f8c7ad8282c488fcf04455d453. 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/CH4132200204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfc4d601a007de3edb7dd3e24dcc07e13b7f3a197a6cca1a546865a253558a5. 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/CH4132200205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e84819debae675cd8395ad480845861a87498f0e99b0be7ec3c156928a6de2e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH4132300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9fb7af87fc81fe0cc8c8cae468b54974c8f6c8a76597964704a4ef6e142897. 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/CH4132200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec02ea48ae82341b9012cb996e8dfd8d2e7c58ee82b8c7b5ec069215ceb2f7ed. 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/CH4132200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec02ea48ae82341b9012cb996e8dfd8d2e7c58ee82b8c7b5ec069215ceb2f7ed. 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/CH4132200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6449dcb529af1d8ffb68dfcfa0638b431cded9ebe40282ac3c0e7885dda07b67. 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/QZNWX2242454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2b320ae88157ce6be81080f5985a58266414627c79de8d8622d6c6c78c56ad. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZNWX2242455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c05e4e54bee4fca472435f1c48e856d69d3f60830978a0d806428430c4e286. 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/QZNWX2242457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a741d4f23c7af21d1c663100a193cb0b561750c5f1415a11190f2c9eaec75f. 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/QZMEP2202376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12bc567d76cd7747b8fb9521f9e22a27982beeef54bfd7f82a8927653df58a70. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CH7812196679.
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