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 0x9989ffd07433495a7b49d738aba550f201e645c59147d0266ab3634eb23277fa. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d28c539e-067e-40f2-8a90-b36ee91e6f67.json and https://artists.proofprofile.net/proofs/artist/d28c539e-067e-40f2-8a90-b36ee91e6f67.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Buchholz-Orgel der St. Marien-Kirche zu Barth (Handke, Emil)
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 0x114804f5cdaae82e883cf1c3d475da51970ce81378f1c1f4c4ee35c9243df2ff. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ROUM71500128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b726c59c8357e416409d9476e895ec0c282c2f966fa71802a1c26bd37becf12. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USIR10001170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7972dca4e1598e3ef436561e92a31c5b6acb1a086495395a2a8d58e52ffdd0d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USWU30006502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582e8d4bdb47e63a039d901eee8f70d449c115c8d62fb14099b6d23274491b1d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USC4R1601984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2774ef20fd5ed7371afbadde51e7119f25cf8a9001ef2ce0b2fc71e7c43c2ae. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHR11738186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccf31c296888fcde5e1c5efea2284b0fc1a18cd3602cfe96f4663a55c98342d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USIR19902309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7b48162b0e19862a4177ba6bd03ba491a4e9159a033124d666faff37fbda8d. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BDA081701278.