thumb|right|Echo chamber of the Dresden University of Technology thumb|right|Hamilton Mausoleum has a long-lasting unplanned echo An echo chamber is a hollow enclosure used to produce reverberation,
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 0x5f69f94ffb7bf02bd462a9852aedd1562930413ccbf39dfaebd93ab05cd38918. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0031dbb3-c8bf-44de-9f48-8666735af0c0.json and https://artists.proofprofile.net/proofs/artist/0031dbb3-c8bf-44de-9f48-8666735af0c0.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 0xe75450ad14e1118d049f5b403209aac18534194fb6b3841d6645d267b02c9958. 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/QZQAY2405810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23c155e107f71d17ee1e2cc9e23af41bd1a941e7dfd4f7a813f6955f58eb44f. 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/QZQAY2410030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c336056c7d7a78353ee19a71d24ea7cd3aacfe583f21ba2a251c3028f140c8. 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/QZQAY2438346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7f6cbb8af04ed5b861f185334cd03f8ea43058750d5b861b0fd8bd6eac884b. 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/QZQAY2493037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19814dd96948eaa678f6f51fa396a3d9cac783c5c2b3cd8005ec68d1d99f1d81. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZQAY2423029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e3daf4bf91882bbdb06667b2b692e2421aab6ba148543a17af99851c3204da. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZQAY2422392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc906300af366e2672686cd4f10b89ad91f9f28c35294647b11846815a9c6d319. 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/QZS7J2370205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2b2b560115a6a9ecbe6ca6ac92b2f340619f4193e2c46423cb4111c665d369. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZS7J2344371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ecfc5e98bbe5d36b8718e8c7a90933bf1e1def6d119299806f3fa8a097e5a2. 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/QZK6H2211006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb075ddaed16c1a9d6091bb634860a0f79e9ae64c97947212be5e6ae7f93e0050. 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/QZK6H2211007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b03bcedf58b408a773a1181888abaa7889828fee33ee6df96fe57d8694a853. 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/QZK6H2211008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb681bd3b37af2a7af922bce8cc943a0a9df50ef10fdc226d1830501b97bd66. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZK6H2211009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb102e6daeadc615ecf672580d59665c6cfa34d85776be57350baaca17755e057. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZK6H2211010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5aa77d15a55840f096a45a465b1e02eae7aea67141c8782a403f78365a3b99. 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/QZK6H2211011.
Scheme Until It's Your Reality: A Hardcore Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0356487442cf022c3f11a74b2dc937f5a7da922d8a483ba58ad3e42132c3ea47. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZQAY2355129.