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 0x89ac0a06e6c9fa0858bc26624c89c18a768c1c6d3130747c88122986d102ad20. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6a96471-0152-40b2-a55f-79a8a4e92727.json and https://artists.proofprofile.net/proofs/artist/d6a96471-0152-40b2-a55f-79a8a4e92727.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Polska in Dalarna & Northern Sweden, vol. 1 of Scandinavian Fiddle Tradition
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 0x1baa6663bd9d3eb65eeb40aec91a68afcc08248b08cfc8ab2b84e0020bedb61f. 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/USHM21013886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21722e1a71edc08db4a8ea458f5cc14fdcc206e86a502f0aaaa872f4e5d3624b. 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/USHM21013889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ab812457cd840f363296b41d067ba75a5a93c959ca9864c9de34cb1ef0dd40. 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/USHM21013891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a22e3a2d9b66af3f7b0188d70781d4bbed13249e3ccc997a1a811dc3952db1c. 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/USHM21013887.
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 0x7fd2ca355f19c177dd1c308242aeac3cef7938e19c649930b406bb014b3224b2. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/USHM21013901.
Bingsjö: Polska i G-moll efter Pekkos Per
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1520b47ec7722918bf2db2361f2ab723f7d5bbb6a8730b4c02d12cedf46d581. 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/USHM21013902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba91c0fc59355ecd68548f1aa5739f513db2f185f61b07996fcb67b420f8ab6. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USHM21013905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b3f085af8cb89793394512f524450670b3aa0f85c2b45e74c3356b0543cce3. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USHM21013907.
Jämtland / Härjedalen: Polska efter Olof Löfgren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92021124d2afc20493ea5b50082acecfa2babc354bb22d11566d200cb3e4f1c3. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USHM21013909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc87d0fe45242eadc0baeedfad83d8ebbb0cfa145a4b8032a6f18c4f06da58f7. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USHM21013912.
Polska in Dalarna & Northern Sweden (instructional version), vol. 1 of Scandinavian Fiddle Tradition
Polska in Uppland & Southern Sweden, Vol. 2 of Scandinavian Fiddle Tradition
Uppland- Eklundapolska nr 2 av Viksta-Lasse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8eeb53e4d7585b92debf169cbc59d5ba95c247c4a549689df9e67d74296647. 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/USHM21163694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21469d46b57e220d237cedabcd92925e869f67f42c52505ed07274f36e7f567. 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/USHM21163707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25226c62b68316efbb0794b5e6f0978f8d9092a17e3f83695d83ca57a8c423c0. 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/USHM21163709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3fd9ab9fe498303be2825ab13fbe26266b89d7ede80b8f3cecc3c1d218bcc1. 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/USHM21163717.
Waltz, Polka, Schottische, Hambo, Mazurka
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0710d4fdbf5c698573e0466900e5803caee01344f306804ae12a08bf28ccf377. 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/USHM81232652.