thumb|right|upright|Lucca Cathedral Lucca ( , ) is a city and comune in Tuscany, Central Italy, on the Serchio River, in a fertile plain. The city has a population of about 89,000, while its provinc
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe0cc8c53342d05ca2be7e42928d5bff75c4a5e3d6979d68ec04b2065a26c96. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/efb10dea-2aeb-40b6-a2f7-02561fe6d0a5.json and https://artists.proofprofile.net/proofs/artist/efb10dea-2aeb-40b6-a2f7-02561fe6d0a5.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944ce7e2767b7ad4608507d391c43c9295c4ab53e3bba263de2f1411e1d30ba5. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:37:11Z), 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/BC1GL2450866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbfde41372ca63105eac9d1a25d68083a7f4798848b08f617a4568a30581590. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/BC1GL2450867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf291386c503b16966f93a1de26a1477c08d68a05c3ea953fc25e990074e9ce5. 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/BC1GL2450950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7394c126a7b9edbb3e312bd1826758034ad13d6aebf937d2cacefca5ba758d66. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T13:47:43Z), 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/BC1GL2450953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995dcb7cc94b623828de60187f740d28197e34aec01a8184c0d5beb0088f2f07. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T10:44:10Z), 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/BC1GL2450957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3a77ae1e3f4d737580c8e64d239734c24b96bfedd5c28dea48cc07c26372e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/BRUM72500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88971b4aac7eccadd58db94fa063c9f9fbb949008a43997c382bc64b85d9b361. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/BRUM72500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d27350b4f0755ef26bef30c812a3c4c0b2ddde2bfcc7385ccc3537963999fc. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/BRUM72500108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73422071f79f090c959fce6c12f2b9dab19756122ffe236ebd9e2586e59c5ceb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BRUM72500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979aa89778804b38c70ecfb238adc4f1b010c139c5698c2ce2ff135f0cdef576. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/BRUM72500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2638790d004749f745acdcbbbdc7c2185df15d0d12bf6a47473429ff9b7d75d. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T12:52:11Z), 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/BC1GL2450984.