Choralerna, was a gospel-choir from Gothenburg, Sweden active from 1968 to 1981. They were conducted by Jan-Olof "Jum-Jum" Johansson 1968-1969 and then by Lars Brandströmsv 1969-1981. Choralerna was o
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 0xd9868cfbcc79eda86a6d4c8f74dbbdfb6ea49167406d0988a0f47822751de67e. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7bd714b-9de2-4ecc-9e1f-723c776def78.json and https://artists.proofprofile.net/proofs/artist/f7bd714b-9de2-4ecc-9e1f-723c776def78.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 0x48035733f244d126ea2a97f5435ed7d634a1327a60eb32fbe7a0a244da7979a0. 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/USL4R2153516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71130b85b8df43612f881a704499559bdad08a3a261b72e90687879268584582. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4R2153517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3490f3ca0f1ebac01f1ab6b80c0767b306a4bc0593c0eb47ef3d6487fd0ce15. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4R2153519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92910eb281e097df3d6bb815e213d722e2b95e30454324d97a38665c983ecd3b. 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/USL4R2153520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d565bc828d63b6d9a49e4a4d5e39e4e1989a3bfdfc21823d7203d20627eda8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4R2153521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e44ad6cff4a90a74bf8a6baad21afe121560d87407b660e74229f4649143512. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USL4R2153527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c9a3d8c8b9d8b625492f337cb99fad15d1922e9c20fb58b11185eb232220ae. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USL4R2153530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b50be0d621677dc9d9aa9d5586b5f949372726f1f7d5cbd0c6b02a4f4f441ea. 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/USL4R2153532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f87ba33703b25401c4e6a5c53f54ea0d34f335aecfd4d16628816afe75302e7. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:53:05Z), 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/USL4R2153523.
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 0xac4716a0f5b92a21a1d72aaccdf31199ccc9cf81ad8d1dd8379be69a8f6aea19. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USL4R2153518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87253ca95cdc8bb74aa23c7c9ded2b82e51020f779eb88b8336f8ab69e1a9d0c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USL4R2153522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8f9567adfb17bbd1c77256b861796e19442521f29ce42e7604e1938cecd80f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USL4R2153524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d33c46cfacb28d8da7fe135fe68ee5710f7f28be68c00a384b76c539fba83e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USL4R2153525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6546ffe78a9823621486faa179889f55fd785eb2aa70ce6955aa094000bd7020. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USL4R2153526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd803dba4b468ffc9fd60a46b5d85539e71c2c90a8c6b6ac333cd343c724175f3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USL4R2153528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c16146c5c6c72461d234854c5725a84df6653e187e50f910955c9059b39cd52. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USL4R2153529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f01762262a104fcd2b83e7867ebd182961708625e6bc56970c6b481ffb9588. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USL4R2153531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328a6df7304bf8ddef76f5b751002d4c342c716099e030b0fa58065ee350b5d1. 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/USL4R2153533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72619b17bfc60582e8dce45a347feacf02f8caab080f2b2b31c82323385becef. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USL4R2153534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada75b9be3345aa0d76afab4622fd9ced7902c9c5982f02ca658eab8c0849f12. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USDY42185090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236b41efb088fad599dd30abec2ab8c7c8930d4f79a5e051b8673984381d7ba4. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USDY42185093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4799b8dd50f381e68d5c2acc6eff6bfce31e3cf9dd63009965e20346b0fec50. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USDY42185094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8424801379626da8c515609fb4ae19b51a368a587e1b194825034e2d41085729. 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/USDY42185095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd2548e809d77b6fffc12cd8a700b8aa8477a555bcff797e7752076b4eb930e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USDY42185091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d28e562b5c3a12237e9bc54e6bbd897385a88ee25e88e3b1ad4ebd906c26da8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USDY42185092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe905d3aa2ee735c2130497ba8179f50aec3191bfb21494e907912fe1c6b78893. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USDY42185096.