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 0xf0910f2d1a8a6cf686e959ddad40ef97518fe0bc345c28756711368a6ae254c3. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/315d6ec0-09c1-4a78-b1fd-26dda7ed4c22.json and https://artists.proofprofile.net/proofs/artist/315d6ec0-09c1-4a78-b1fd-26dda7ed4c22.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abde12e433f8f9d13c099bffae7aaef38d0291b75c499b511beee1aed52638e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SE3SA2204212.
24 Polsdanser frå Finnskogen / 24 Old Fiddle Polsdances from Scandinavia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6b2b5a3636abb1c0208271580fd33ddd97073f84f3c5eb39fec4a70c24d58e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NOBRA0201010.
Polsdansen Puken spelte da Grue-kjerka brann (etter Jon Østhaug)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b6a21f1fcbc213512ab4874c5ad0aff310227ea9ad49907b86030b71d7b1e7. 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/NOBRA0201030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df4ede4058cbdb9cf28baebf16baaddf9838260c6804f50682b5c5442364e0e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NOBRA0201080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81f3998f0480087d9907da14643dff9f32878e398d865ff0a9549c39b138d48. 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/NOBRA0201090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bb21a5acb0b04b66b30ffd8302a22547eb989670484ebadcbca0a96e60641f. 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/NOBRA0201120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bcab2a7b44755a64c95dc6ea33821f06b3a6ebb9a600356be3e56c5f8bf7db. 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/NOBRA0201180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7635301e1341e117f3a07d9387ade689c4cf2b309f241e995bda5e9b4f49faa0. 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/NOBRA0201230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8495496da1dca5c80386224d969e9655b3602a218869983a72d2d43220536a45. 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/NOBRA0201020.
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 0x45b1a9e92c5547968615f7678297a0b59ae5920196c34e2096beefe539d5d3d0. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOBRA0201060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f0c74559e0f1ec907554eeda33bcb42006372887d09dff765fb0749b403914. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NOBRA0201100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37a608607df0375f382c2afea8e6ad187816381f8df8c62e51446a2893ba4f3. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NOBRA0201110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a648110d7b5024ce5d99fbce8109eda98f121c23f507bbe89a89f457fcee917. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/NOBRA0201240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa6a90f85d9783d35c49add4c67781b545b7066865418ab9e24874e778740fd. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/SEVJH1502401.
Three Compositions. The Finnskogen Exhibition Norway (Live Recordings)