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 0x6461247495fab209c389b26ff0765388798bb0986863186f7297403d48b750c9. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b669d1f-bb46-4d55-a2e5-2fc9b863b6ff.json and https://artists.proofprofile.net/proofs/artist/2b669d1f-bb46-4d55-a2e5-2fc9b863b6ff.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 0x840edbd511a9baac03c83dbbf1ebbbe7ff47e8e680ecdd2a38cd6c4655807fd6. 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/GBLFP2269800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707cd2620b67eb9fb899990b9092d463c2141f27ce238c9d866caca01b1abcfc. 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/GBLFP2269795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e90b8a3ea14318062814a71ca6a5f95bb5869ed116891b575ee043392b2a11. 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/GBLFP2269798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ceeccc8e74db6f0a90af0951c1ff1cd0c15aa88d80fea5099560c03dfea1557. 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/GBLFP2269796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9fd144cb372c122f38d3af165a67242b3f50559b3fabb33a0a7a9164a4c674. 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/GBLFP2269794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcda2854fc30f5db86c2de5c154b61d5f6ec25d6362412e6a8bc5d10001de272. 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/GBLFP2269797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11784463c3f638a0f69a41c061daa1bc0c78e4cee3cc48bc7827ad7e4293648f. 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/GBLFP2269799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ca879937bc8d4fb04bd5df979e42b1a1c1988eafc5364032044deb7aabd8f6. 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/QZTB72369907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a6872dd464ad09d5ddef6dc2b8ae95ac6df9fd93aae4625029e168c6c4c1a5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB72369908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395119693117082a12b0c9b12475d64b9bacc55e97cac1b05a5c23ab608e1176. 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/QZTB72307032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3475f2fded033178f9f87b448b874e06f08b8db7e929ff335d0df98b3da897. 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/QZPLR2304207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389e572890ec69b7a032ca8f3c3a696dc8c631bedfbf3413722efc96ec5e474e. 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/QZMER2358808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae13436f58099143b05d1c57e6d35cd55d9d0a918b3609de1bbf8ee7b5e568bb. 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/QZMEP2387886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564470e75a78d838cd5dd4e40b1969cef6521839c025d28b02689872a2903ca4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMEP2389672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3bcee3af0656df18cdf8fd740bca88449f0dd298148bf6c900fff504312d1f. 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/QZMEP2389669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ba896bed5aa4b6be5d43f735953af018805bc63d7223dfd6480ec65414cfcf. 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/QZMEP2389667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe252241c70b4fc99cdedb6cbe4e81862b73b694bafdccf77d00587d5c4fbaa4f. 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/QZMEP2388582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35aeba81d860874efb18da57d389456fa3f61f548ecb4b1f3bd75409661ce626. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBLFP2218696.