thumb|250px|Bull Rock, off the southwest coast of Ireland, is often identified with Teach Duinn (the House of Donn) In Irish mythology, Donn ("the dark one", from ) is an ancestor of the Gaels and be
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 0x681f3211fe45b3bd9cefcb5c1f0754f7511d3e4b5761c8741bef807e51236120. 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/698f2605-7e51-4229-b50d-8115f3320800.json and https://artists.proofprofile.net/proofs/artist/698f2605-7e51-4229-b50d-8115f3320800.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 0x1b28a5a21175c4dbe51a6edaafea95773b63ec3dd092e2212e43019df2e4a19c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZFZ72035952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b49e9c4a4de7bd7c05957c64eda4fbc3be3c9d74cbd827556119dfc95552819. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZNMT2024293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2cd85b8ec47db03fdd48ce68ac3d034b82e9ba48d24c0881c5c68bcf3e53113. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZTAT2298999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3273cac4d8151f64cb6d7134c34194f33914d82c1d09419b3ba732169ac7a4. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZNMT2049418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfa26d19f2485f584aabd07a0fd5269f42461210c9d5ee2fb77756c6ea97b38. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTAX2294922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1045ddd87fa195983bbb971bf258dfce988acc3a578bbc98c3c62aca4ef5fb1. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZTB32226818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3e6ed2c2a931ce5cdcb1f3ee6a9edecc2af213c31737c656bb4623f195138a. 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/QZTB32226820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc087c53c2a0fa85529c2012ad432eea3cd37f7fe7922aae0c8519a47531486. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTB32226822.
Lost Tapes: The Hilton Collection/The Grammy Family (Deluxe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a3c8053381e26964117873c393de403b299f7dd6d2e832a3006d3fca8a9118. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWW2130625.
Lost Tapes: The Hilton Collection Deluxe/The Grammy Family
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc536f55cd272cc6cd7707cf8018f68e556b1fa15dc2cc730d561c0a0e08cfa. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZTBC2362053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c4c9d36684cf0457ffa81f7bb8585a53360106a964055c97dd0c6332334b8f. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZDA42472936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441cbb95c2a544c005a6725ad4fc6a309635687a61ba0ed7539f6c3754db9699. 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/QZHN72428553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eba51fed45856546f9cb486304a27ea1459e06fa5381a86a0241f19aa984ec2. 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/QZHN72428554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc87887e718f5b2b29b3ba10cf3610c911fa17a5c032db0e89aa0535ed3e8d9d. 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/QZHN72428555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1b16328eee2f3c9f70dbb3a82446f162454ed6820dd6d5e5766b5d26edbc37. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZHN72428556.