thumb|Feis competition A () or () is a traditional Gaelic arts and culture festival. The plural forms are () and (). The term is commonly used referring to Irish dance competitions and, in Irelan
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 0x2ebbf82d9dcadcac77362d21cabea0fc76f7840c81dea89eaf76c162a3fbff49. 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/f1d9d3a5-c49e-436c-9dfa-4d0ec9a93316.json and https://artists.proofprofile.net/proofs/artist/f1d9d3a5-c49e-436c-9dfa-4d0ec9a93316.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 0xe53cc6539883426ebbca6a5cca4bb743e68d82bc77d0351edf65595d48aad169. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:11:30Z), 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/NLG661400558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da7e1547d9608c583d850e774cc6913d83ab52012c3bd13da73c49bacd3da1d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/NLG661400559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f1af83813f02e51338c31dac677acf4495f0aba4382dc2f485c82d641d5785. 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/NLG661400562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009b925a89d50eb365173b812aa62e5584976d2e1598dbfe380ec3aa06efd267. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLG661400564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef29645aaf421e2f5c2dc44edf3fc34dc30d55d5ec191d2bc9f19382a3b8ca1. 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/NLG661400566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637c2ff724eac9fe7656f5220f9805a4831cef355721dce0a4a37c38bb910aa0. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T10:31:18Z), 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/NLG661400663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3495e97d2ec0e03330c17c27ee33847b5f0d417f37cbdb66464f21481bb2ea. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/NLG661500323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e51cba9e16803d38735dbcbf74db0a571694cba14bff101f0d399edfff8946. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NLG661500322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd11a064dd92cfbeb829e4ff03ec5333955339ca5fd2c5118c2bdf7ca7217ea. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLG661500321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48e894790a07ea899bd3e50a9b82638fad9c9b8cf0210a025d84a080ddb946c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLUS31700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63ec2a39195835b1b8c656ece2f0ad4606d04300750b49752a1e662840f2069. 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/QZK6L2253174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54876374aadedb9f4cce852eff76cd1264cb23a1186ce98ac9701b302242feab. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLD321000099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb064199b230034b2f22b198d8d674600e6c566bb65b64cb2fe37543463fa03c4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBLFP1754672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001234b25eb107ea749c222e428b86e36f583f5df9b65272838fd2a8d2fa57c6. 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/NLS5K1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48e894790a07ea899bd3e50a9b82638fad9c9b8cf0210a025d84a080ddb946c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLUS31700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123dc3582beaba4451243ad4c0f815a927623715622fe919416dfc17d68c6fea. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLG661700973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5338be0c8c58600a86ceda04b270ee6ad848bc6fdf21392c9241d4d428451ea7. 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/NLG661300316.