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 0x69da4c1d6b32effcaeaf42d9bd3b7d350f330af64530dafb7dc236ea4d836a22. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d250742f-e73e-4f74-b708-d153193e303d.json and https://artists.proofprofile.net/proofs/artist/d250742f-e73e-4f74-b708-d153193e303d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x08d9b30672f336bd4acf8b9b2fca15db6b43b60c78e38785d3752a091b7837a3. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/INW131204456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c8752340643261798144a609f1abc03c4b246a5d6617dcd5636d7385aa416d. 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/INW131204458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf03b21edee260f1094b88f81f126c8078c70bf76429657cc85ddfebc530f416. 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/INW131204461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bc819f40fa9cfd15edf025c4697d2e8a1e70d50ee3b3c2e3575ed45f5a0c71. 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/INW131204462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5320c978a0b4114c8e31c8e62546e2ca8d229c8a803b9d2cbcf1e41e0a9692a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/INW131204463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205e6268838c7c709396c71fa8a350e76ed187dde173bc7c923815408db4642d. 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/INW131204464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1b69a1e07940f8349b2dbf8cc3918ea47f6c98c552b1a0ecd3611fcafa4ac2. 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/INW131204465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeed13cde98d4d6d1a156d674c0abeba82218a25a7d21b38bf0ecf2060a45f00. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/INW131204466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaecd175cc8b1033d0039c5834743ba1fbf0da6334dd9e9cb8185312e4e9e386. 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/INW131204467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf183cb2b7812325d8604a7a3535b3355f6998cf6147b59f4305255faef46c4b6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/INW131204468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44ad148cd2d4b08fde9172d12e62e009a27569c9d93c1cac41cf893afae02ca. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/INW131204469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a092ea99fb2b45aa433d8be9191594a2cdf2eef2637d945e90c858cf82b473. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/INW131204471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52deb952ab94cce58c47bb99926366e205b1bb77fd1a54c2c5ccb8cd7179cf3c. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/INW131204475.