Grex Vocalis (The Singing Band) is a Norwegian chamber choir, formed in 1971 by Carl Høgset. The repertoire spans from the renaissance to music by contemporary composers. The choir has been awarded th
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 0x50e7a67cebabd74670cdb6ece4b1d7059bb53227f7ecb8bc20873eca93290d81. 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/c4f52be4-8b6b-4e6c-b8e7-5188a50508f5.json and https://artists.proofprofile.net/proofs/artist/c4f52be4-8b6b-4e6c-b8e7-5188a50508f5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Grieg: Våren / Letzter Frühling / Last Spring, Op. 33 Nr. 2
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 0x35c1faa4b9b54a37723f3826e8d90c80398e9a4b92bb09084e64ff9861d43c90. 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/NOMPP0705200.
Nordheim: Draumkvedet / The Dream Balllad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91d173d9574e2febc6546bad8045283c63e154669efbe8138be59894e14d108. 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/NOUM71100918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3165f7353a71e97472aed38d190defe0b61416ba570e30494cbe7b8297600362. 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/NOFKF5865060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f9d25316bb76db54c9eecce63d590ee758db154a2b3a8a5977b9ca2f954dfe. 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/NOFKF5865110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc167f79297a10f3f08874ddf7819d9b52380f3fa4a2772eae15dade791681a2. 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/NOFKF5815010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11116eea9fcf02a03126b16dc4b45af7aaa54049251cb63b9d5d886f379b4300. 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/NOFKF5815090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5945f83e31d514d7668ab90682ac76132701ffc7f53b7af384420f7761d7deed. 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/NOFKF5834010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efcf0cb1f424efe82566fc9f593add5b73abaa6d03b2a5f9c3289b7593b6513. 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/NOFKF5834040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ee121ecf87ec419c55a67884d0ef3e857017ed653ef8420c3a78ef65f09cc1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NOFKF5834060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e80cea6df0fa642cadb4537419cbc21af218c163fa744c73b7c06e4f54b1f7a. 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/NOFKF5834070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e858b69af85a98beb50f04c87cdb06e9d230a53d8f1c9bbd62787328b81c2d. 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/NOFKF5834080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04009df00c3360a0460060591502be922d62795f0ec6dc5f6e34aab18bee52ca. 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/NOFKF5834110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ebc074434e9bc19426264f33d178adee441966ae528f462c788410726a2b738. 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/NOFKF5834130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8508bfae38a45b426eb3a85dd953ee94d0835a572212c781bdf96c6dca51763c. 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/NOMPP1106010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4502fc56de2f1696c0d1d243f56def8e5d0dd541906dd54362d0ea73dc74bc5. 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/NOMPP1106020.