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 0x99a80dc2e29c82c0c88c6edbd883d84db16ff6c09314d458f38d92456e1bc238. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48b85e36-a25a-4e20-9bb4-c95d343e84ec.json and https://artists.proofprofile.net/proofs/artist/48b85e36-a25a-4e20-9bb4-c95d343e84ec.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Fredmans epistlar: Nr 10: Systrar hören min musik
William Clauson sjunger Carl Mikael Bellman
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 0x903643fa72302362f6ebc63f4189e5c06e86093fb22e8659d182a36c6343cde2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350501 — a six-check JSON result.
Fredmans epistlar: Nr 2: Nå skrufva fiolen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18da685b17ccbcc7fa8d8a5ee6ddce22206b2030d49b59de32ed993ddb1a2c8e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350502 — a six-check JSON result.
Fredmans sånger: Nr 38: En Potipharns hustru med sköna maner
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9222da388861bb0d9282c0f4cfb82051c658f63a1069f83baf0a0fc33d4c3f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf823dff6a868e4320fe69ae7da2c7655a321093d8a091436487452f2bc3fb80c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350504 — a six-check JSON result.
Fredmans sånger: Nr 16: Är jag född så vil jag lefva
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc960b60c555dedb60e4c77f355d69175f7f3a3b0ed5ef9195eae12c345d8789. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350505 — a six-check JSON result.
Fredmans sånger: Nr 10: Supa klockan över tolv
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c7a213df1f2e1561cff0f2d1ac8b62a506023f88f22afac74acf91ededadf2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350506 — a six-check JSON result.
Fredmans sånger: Nr 9: Nå ödmjukaste tjänare
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753aa0fe0d05159400c4de368ef3bd5abf22177f07a5414dbc60b9c99588dae9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350507 — a six-check JSON result.
Fredmans epistlar: Nr 39: Storm och böljor tystna re'n
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f7b88a5a48f0df9015f714db0aecf312d6721d2bc7ebee93bc7234c486d8ba. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350508 — a six-check JSON result.
Fredmans sånger: Nr 56: När jag har en plåt att dricka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6128dfc7538143236d4eb47e66b315b3ceddaad142c9eb43d6d9e0a58f345568. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350509 — a six-check JSON result.
Fredmans epistlar: Nr 71: Ulla, min Ulla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d81df4ec0989ad681d9f8b7dac42094946ae3da8fe7b427a785c124a259e09. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350510 — a six-check JSON result.
Fredmans sånger: Nr 64: Fjäriln vingad syns på Haga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a9d137903c4b65a0ac148cbc407b3643300586de217bfef8668b9956b553a3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350511 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df379a9b896fc671b54149f5cdf9153ff3af32de2e2b284ba1ceb073a0d0e69. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350512 — a six-check JSON result.
Bacchi Ordenskapitel XIV: Böljan sig mindre ror
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872f8262453f16a7844fa7c38572ec2b5382eefef9addead70e1d8074bbf5f58. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350513 — a six-check JSON result.
Fredmans sånger: Nr 11: Portugal, Spanjen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd293bb6a58453899dd321a2208cbcc135a8f48f9ac4c4c4896f25818bb8fe87. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1350514 — a six-check JSON result.