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 0x6a29fd757be1bd5e95da007a52a9992153626ba9565f2e512e0590fc22002a92. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d93cc8b7-60c4-432b-b0d2-6adae3198f36.json and https://artists.proofprofile.net/proofs/artist/d93cc8b7-60c4-432b-b0d2-6adae3198f36.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 0xcd1f9dd56c61f82b8e960d5eae407a2ddf0805f5a593b164bb2ae3bcd40d1d9c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TR3921600202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8990670ff53ad01d8b0c276cb679899a4edd91de1c1450675eabb70c7c7b4f. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/TR3921600203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0df94a2e1cec21770264e7b85ebee8941203a183187d9955cf6cd17c4aca4f. 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/TR3921600205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2670c267265fc4c4d8a5d2d9672d8ffc0f24196883f483fa881f4969861dc8. 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/TR3921600206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50b7df09047da7c974f07bebe185a9005204a805b4932653b94b236f8257ea2. 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/TR3921600207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677179fb7f7bb1ade71869c3225562aac13b64c291d2eb7cfb14700a938eadf4. 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/TR3921600208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491afac9dc80f20d2c4e4ad032f4c295561d4b82cff97f58a253f1929529d136. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TR3921600209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f5c5176f9c5060842cda6df323e9a25aaf9b2e5e8195d9bd717fa1fd2f5654. 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/TR3921600210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782533ae87a2b847ea6ef8171e4f8fb18b74a9fd81118c0f1ce553fde010cbbb. 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/TR3921600211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf267398e44ccc022da67f1a0e8f3203d501fb0960090c72b51435beeb2bc3e5. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/TR3921600212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c90ced6d83f7c3e834b909294da9faaea8f71288ae0d84fa2286b869f5f9ace. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TR3921600213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11db0df1ad046aba9c4c690c786e3796bed18bcb418380fe1fd84e2246c52476. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TR3921600214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc92a89f8fb6694b5a11fe2aaa4895a58526a7beca7f65122fe83f6dd0391d1b. 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/TR3921600216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eff2b8ca936a14e2c7e535e894e67c234938a1658e33fa87283971d4a798cc0. 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/TR3921600217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc044694f0235e962f5923e9979ca551f9dccea16857abea429307c4866d3b9d4. 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/TR3921600218.