thumb|upright=1.1|George Frideric Handel Flavio, re de' Longobardi ("Flavio, King of the Lombards", HWV 16) is an opera seria in three acts by George Frideric Handel. The Italian-language libretto was
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 0xafb096f86e4603152194bf6d7654e7ace3f81e65a2ae49b3d89c9b193de3140b. 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/6da7eea9-c21b-4dc1-a63c-1b1fad7704fd.json and https://artists.proofprofile.net/proofs/artist/6da7eea9-c21b-4dc1-a63c-1b1fad7704fd.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 0xaf6f2de3dcfe63c52fe41cf1e2c3f96ed105468c10c0a53084054acb6f25c48d. 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/ES5682000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939ff6825e05e3ede5c2a778af50e8cb307b8530d5815671d84c68a8ca5148dc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-20T00:28:34Z), 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/ES5682000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dbbcd73dfa7e2612cf19b6ccd6bae60dfeb901393b7d8e757f2151d5b01340. 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/ES5682000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1593644089ad809c501bc040d9c4521c3774627e93cbef5ba9d5930124465469. 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/ES5682000099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d14297a237cfb2a953acc8bf3b17eb582c6adec5591ff72756091afc36b059. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES5682000319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a61d4da0a88f317f76289fd1781b4a7e83b664c8a631e9aca241c4dfdb5ad1. 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/ES5682000324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edc1126df79f7fb7c1f24de774892d84da3e04007c48fa815e8f0c62a43d3fb. 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/ES5152001272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472a3afd606c379982cb8291a185580dbb1cca79b66b75c8404ef64c2df4f785. 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/ES5152001256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812e3e06ce2775f677515bc8d7ee4c8d6dd988f66b9db6feb0b138ce3464ec5c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES5152100135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86b452ad67ec1ced1c679b40c708fca1a8032d2ec5a7830c4c9f759c6fbbab8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES5152100658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231c9f1483d461be7915eed3576811558bd4cbb130c4c3713896943ea2f77b91. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES5152100543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45730992935e25d65b3ba751726c36b0dc01692a22e01ef78d5592cb9d839833. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/ES5152100552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ff68968d66d7c16c2d4420e3c655670f0de194a7502618fa250a3077baa102. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ES5152100553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e53395dc010753dc4df9693787bcc7139cd8ea7e7e3c177d0c5f0a193b45ce. 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/ES5152100555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fac070903c2fc6389cddf322fbcdbd9eb3f30175459385043d749684b52169. 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/QM4TW2020731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939ff6825e05e3ede5c2a778af50e8cb307b8530d5815671d84c68a8ca5148dc. 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/ES5682000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6f2de3dcfe63c52fe41cf1e2c3f96ed105468c10c0a53084054acb6f25c48d. 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/ES5682000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b0e85b3967a773cd6dba93d2840c21a2354740237e2f8d0d2d10d078fa7d10. 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/ES5682000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5dbbcd73dfa7e2612cf19b6ccd6bae60dfeb901393b7d8e757f2151d5b01340. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ES5682000081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f67cbaaeea93dcb0948df3b84b53ec618e056ec6097ddf65ca202036399e7c. 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/ES5682000308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1593644089ad809c501bc040d9c4521c3774627e93cbef5ba9d5930124465469. 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/ES5682000099.