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 0x9b8eb588bf3601433491b20d60943b76a46526360f0f25ff143f8333574a5a4d. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/174fa1b9-4aff-4bbb-98f8-cccebe962771.json and https://artists.proofprofile.net/proofs/artist/174fa1b9-4aff-4bbb-98f8-cccebe962771.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 0x07095bbf1afa5dcd7352b09c4d9ea60164e04df158302b07bc768737ef71e8a6. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZFYZ2472768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e5d06dcf9c90960372a0b184aac42013c4b86a8ebd59945c070f67173935be. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZZ7X2498804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e5d06dcf9c90960372a0b184aac42013c4b86a8ebd59945c070f67173935be. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZZ7X2498804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25258965d266c39467050781b75f11c6b30843282715673934b9d8bdc94dbeb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TX2565275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5b615d2ab854b9a3970b086daefb3f8eacbb2871f58a551f5dbea362ca1edd. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QM6MZ2569028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d6f17b9b2475bda2fa7a54694d3a1121204a45b768932c371651f4f05a16ed. 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/QM6P42520455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e5d06dcf9c90960372a0b184aac42013c4b86a8ebd59945c070f67173935be. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZZ7X2498804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cc07d6580fa103508b270c82743d1f670c13f71bb4bc572751f886a3f416f9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM6P42520458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387aefdb6b3f7923bb87a1b2aeea9c48ab32e38fc053812d9d18fb0a10f6b9b0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM6P42520460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0846901753abcae4d5a37dd66df57ccbbe12c2f2984e4d9f11869940c1155308. 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/QZMEM2408370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b67dbb517fc0810b606ddf3d33a4d42a89c7d9d3509227cd7a627ea480522fe. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QM6P42520463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1f3cd0e79cb5b177670d96d6fd69a2209d4815d2e135aa88b83b3c587c831b. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QM6P42520465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5b615d2ab854b9a3970b086daefb3f8eacbb2871f58a551f5dbea362ca1edd. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QM6MZ2569028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603ec97b0c81f44a0d2649fd0a66c61f578d7b7e9c93d1b7de63382095521f50. 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/QM6P42520478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b476a4e2adbc8bded01dafb372309af4ec395a471afa026807fbfabe005a98. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM6P42520488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36a347b3a815f5a1345ee64f079706d9a07ad64237cfd3e5d9ec5b1be10e211. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QMFME2506038.
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