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 0x0305072ecb87dce8478fbd29abe4d52c755c93fbb4660c6b3ae024b31543b873. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/986fee56-11b1-4798-82c3-ed87920a497e.json and https://artists.proofprofile.net/proofs/artist/986fee56-11b1-4798-82c3-ed87920a497e.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 0x7d967201a1b7410ec864aa6c7e760c72d30dd29f5aef6b82fb520c24d50d4b2f. 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/USJ3V2101622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb498b59a564b8e5c4d4bf21069ba78b5653cd197d3b0ab3fd1e5b5feb8dfabb8. 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/USJ3V2377109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28108fb68b080f837b422bd17c580fae3c3d1e5d325b7180f2f8fe6a9da534f9. 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/TCAGR2282872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1243ade8c193d8fc3f9904e595bed6c41a1a1ea612070a3db56bc453e84348e5. 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/TCAHI2355977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7936545b4c47bade41aa9c7988c471400c837c18c5d23a08fc0736c08f1a82da. 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/TCAGN2211220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02c73ddace1fe16b764c5d5b8960c9e9ec4211ac788ee9244dfcdcbd5a08c4f. 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/TCAGG2249325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1727951815659a45bec7db59787089cbc3be732069622f9b9c0ba5e02a36e71b. 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/TCAFX2152603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f6b895c54766ce5e4eee2651c4a7bcb779e0f508397ba12e02c41ee19d101a. 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/TCAFQ2124309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9bddf0a340f9502383ebdaf036cc5485ad9deeb2834d1454ab640400779893. 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/TCAFM2197716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca8bc85197983c532371f016b72d7f19df912b9b42162325d67175c64e1ad92. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAFI2034761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3747e26e454c3d91e3318a36100d163f7e2f320c65b07414e70a932452871580. 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/USJ3V2111823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e8b0efe47101ca3991eccca66b415dc1401300ae0f32e365c5ed677917e2dd. 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/USJ3V2103639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae44b7c7463e0348cc9ce59f429d46a623f79e84aa85130e7fc46a92c5b2000. 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/TCAGD2254747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38503fcefcac0998dea1401e611662fa72718d29ac37ba0d29d1d94742347db3. 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/USJ3V2071142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85af2c8b4d733ae8523b2ba5646928c982adf5f6f258322a31f46d9a2f0ff6b7. 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/USJ3V2113775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863589a03a9444be9e66d4b6ff1ae34be06712ff8b33814c2adb10d76666ef03. 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/USJ3V2105014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07e994928fd390568b3b8b94fa4f0d7df73ac3a91148b371d8538948fcc5dd3. 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/USJ3V2031506.