Sångsällskapet Orphei Drängar (OD) is a Swedish male voice choir and singing society based in Uppsala, Sweden. While best known for its high quality performances of the classical repertoire, OD sings
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 0x127e22d25856df8a7e78b73c83b4f0f5cf5592562b4486d6e916660cd30bb69d. 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/6d2a1ca6-12dc-425e-876e-d9cfdd457fb5.json and https://artists.proofprofile.net/proofs/artist/6d2a1ca6-12dc-425e-876e-d9cfdd457fb5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tormis: Curse Upon Iron - Works for male choir
Incantatio maris aestuosi (Incantation for a Stormy Sea)
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 0x3fb31d3141cdf15c6154e414927b0746d6a9f0380ae7452e70a8509253b6c2d0. 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/SEAET1293010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89c39dfd857ddb57a163d57662741251ceaf20058c845fdb02dacc20cd84b9f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEAET1293100.
Kaksikpuhendus: I. Uhte laulu tahaks laulda (I'd like to Sing a Song) [Double Dedication]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d59f7ed0be6ab712ae875a8bb7aeb27bdc485282089d7beb1e03e75b074865a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/SEAET1293140.
Kaksikpuhendus: II. Tahed (Stars) [Double Dedication]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d3a2079c9eda619c5815b1c7a04ffcff8bcffcc25923cc1486202fd7cda946. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEAET1293150.
Od Antiqua (Collector's Classics, Vol. 11 - The Choirs of Sweden)
The 99 Most Essential Choral Masterpieces
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9aa8a20bc0b17e4b5a77a79567979d58a6e9a9d84ab70f7283ba2613dd3efc. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/SEWDL6001267.
Gesang der Geister über den Wassern (C Major), Op. 167/D.714
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1210c2dbe2d15b0e453ae6660db5711ed20d2e02812cba521e696859fa3fc5e2. 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/SEAEK0033150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b9a4da517d3da3111214a3e6a81ac95fa75001d414d895fd0616c9a4d8d0c7. 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/SEWDL9744321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070ce034e12e468b175ab4b336e3cce19e1db8ecfe238871d69ad2f4ef3ef9bb. 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/SEWDL9744318.