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 0x6331531f4c8f17f4174b5b285c5a51444dc3e08170d49e90bd9818c252ace105. 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/d943e6c7-3fa4-4720-939f-30d183341d67.json and https://artists.proofprofile.net/proofs/artist/d943e6c7-3fa4-4720-939f-30d183341d67.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 0xf82f9bcf34beff26fda09631889cafa082f80a1b9c053b888543cbc383499021. 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/USUM70763433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528363161ef165b27f5ba889b479062b606be33a3c0b534d322ecaf17c7423c8. 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/USUM70763440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2292772d6293853b50a0a1bbd5be332ad913e9dbd2ab8e8e17a17f47df2214. 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/USUM70763446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd8c9e89e33702acdf8ff83088d55ad32ee9022c75d24557e971229f916924d. 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/USUM70763449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2d44a593bfe091af7112eab33e91f62458649572d851dbf99c4b981e463573. 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/USUM70763450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a965b70377b650da425542ac626f9aa049f4e7df1e117786c8c375d60775764. 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/USUM70763452.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7525187521a47866afd7ef0b4b5aab60c3550c0d8d241ba5ce1f1e772d084afe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUM70763453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fd5c0966b42f1982648e1089cfeb7388689307457c9cf2508761c3b37c7ef4. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/USUM70763454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9603590ec5dbebbbc8e66e782127f59bd755783bc7f6d2e78f6b56a12914ba1. 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/USUM70763455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc65f8a580fffa20fe85aa056a014eaa5abcf5d70ff495e486ee841c4361cbf. 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/USUM70763456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220c4099337fcc50d062a7af68a4a6eebecf94b75737c3c8037cd83f00a208ba. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USUM70763457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363245e985b368a3c0517bc286ba9e960b6fcffd13a02516712fe465b9e7ff2d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USUM70763459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788f57eb97ca9bdb0253765363562c822d808f0df308a3577f837ce99b93fec0. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USUM70763460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88b409bdd81a8b616b087766b648de907ff625a7476c22b92908186308b3b0b. 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/USUM70763458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17efa69cc90b37ab8544b8d40e625839a3c04d89f56ac4bf655385f62391fe7. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USUM70763461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22227d9f3994fbffa973d0a48cc26effe9735dab3e071c6c872831722fb63145. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZHN22100038.