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 0x4f8fc29415b3df0be40db04667847ae6b08f47015ef255f24dabf671803a1e18. 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/09c6e67d-b4c3-4978-aff6-d479889845c0.json and https://artists.proofprofile.net/proofs/artist/09c6e67d-b4c3-4978-aff6-d479889845c0.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 0x6acff313a5e835f8193c2845c9beb81ae98c74c31369b95a82056870a770c033. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/CZA659202802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf5f74756114c80585ede035213d900403e78252d4f3a754e8e501855ccf0b3. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CZA659202806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928b14a21b1d5d8353135c14b9d3131461cfd073809643239d4b71eae82dfecf. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZA659202807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b25cd39a4a8494cfeb02048f913862157b4438d229b3d1fc476f9680644f111. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/CZA659202808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78be092d199156267b138072df1136730afd9a8ce28a70cddf3a127fa30f34c3. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/CZA659202816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868fe91b4d44a744f4a8158fa1c146f21c8b59f37096ca6a3ef1231bb6b28bd4. 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/CZA659552645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8eff5f0575ca952c02a07f9bf3c0fd97898a58c66b7f22e707f46272510688e. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CZA659552654.
Veselá Je Dědina / Keď Sem Išel Kolem Panskej Zahrady
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0865a362d7620ec58d7c66286118d3bad32b2d2d57918588202f76f1fc6ae96. 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/CZA659553341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f9df02e6880d18ab55bcfede8424600c312927acbda576b84a6ce73f2708b8. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/CZA659553345.
Na Pěknú Notečku - Podruhé - Skleničko Ty Skleněná
Na Pěknú Notečku - Potřetí - Šohaju, Šohaju
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2390716df65334ee2a7d306fb5ab1e3669c1df6453b372e21fc3d82e8bca83b3. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/CZA659853393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96c890ca85e37f44009a4e5bd07ccf9f2d0b004f01e4541c0c58fdd11f6c547. 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/CZA650101175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9916940feaca44307c80b05acb87ed4ab52faa7c787294ffdb436892ce96edd8. 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/CZA650502419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7e24535aa94b8de842a42525a12bcd42fc81e586b5f4c95065417f83a7d1ae. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/CZA650502421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158e05b1e7cc1f661413a6041006b73baba030a9bd21181252f389f64964ea3d. 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/CZA650301719.