upright=1.35|thumb|Battle of Strasbourg (Argentoratum) __NOTOC__ Year 357 (CCCLVII) was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consuls
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 0x5e670511ea9faf583e56ce987c9b224d299e3d24d5f90bc6c150807d19deaa1a. 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/7ff3f2c1-0b0e-4364-a148-d713a329b05d.json and https://artists.proofprofile.net/proofs/artist/7ff3f2c1-0b0e-4364-a148-d713a329b05d.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 0x73e0588903fd5c3777f261b8288a9419bcb83e96f03cedde5f2e623df010b21d. 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/NOAPI1495257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d30ea2d302401309f577e68581922f758a9066dac158212055c86e657d5166. 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/NOAPI1495260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f36e154071bfa35cdd377a76d81425e15627c8d2cdcc7fa004349d11342ef85. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NOAPI1495262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ba167440a2a906d97823a6530870fd53fe5623465bb68f8f6d925745a5a559. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/NOAPI1495264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df7ee95d4dd4e85465f274957b759f82eff5c9a8cd631f12f7fcc037b5c1e2f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NOAPI1495265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61069c3015945cd9fa9793e1fb40b3c23d5b985f4d43395a4988adc69538341f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/NOAPI1495266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6a6e940fcaea0edada7ff62c395a2680636fbe51dffa46c1507112adde09ee. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/NOAPI1495267.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf99777d3ac09bba1907d5069b7ef5d4fe303bf613bc5636bb3901401579987. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NOAPI1495279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf99777d3ac09bba1907d5069b7ef5d4fe303bf613bc5636bb3901401579987. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/NOAPI1495279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962961cc1ccefe3222da71372a445b8d9c3956413cd9e3b7c290a186d3b07fd3. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/RSA141304191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1406cb64fbfdf8a58ec878d135441542c8511e26c22071942d7e67b1db0fb543. 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/UKXN21984303.