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 0x208d3cff0e80f0c6750ba4a93e192e86b1fd47c844f44c31f28958a09219a4c3. 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/dc1031bb-bc22-4b9d-b5c2-9d8432a86413.json and https://artists.proofprofile.net/proofs/artist/dc1031bb-bc22-4b9d-b5c2-9d8432a86413.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 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 0xd797dc4099e0663241d133be7c6a06f346acf9156fec485d70a076110840c07b. 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/DEN962232407.
The Echoes of Women - International Women's Day 2024
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91ff38d5a658ce6022eaaa7523162c79825d800012783a27498e6f8942d0d1d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEN962102900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91ff38d5a658ce6022eaaa7523162c79825d800012783a27498e6f8942d0d1d. 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/DEN962102900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efb040b921578a24dc930df9a9ff770ef52f0a187cb919ee54da632cd718e4b. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DEN962102920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8a39d22d26df0afc3d1587a4d47830a5a853e50142993f554882df9020c2bb. 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/DEN962200250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790e86a23c8dbb92b9e9e43cc8a4b685aa00c515a35e631c9beb49fb50bd098c. 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/DEN962200260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599291222c2b04007b5f4628fa5d6c02f6a704b977a9f79f9aaba9490fc5c7ce. 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/DEN962102940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512bfa2250dd93b6cf55210a82e7e6ad93126503b270226ed4c7e701f0cb51c5. 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/DEN962102950.
O vis eternitatis (Arr. Tormod Tvete Vik for Solo Violin and Strings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270fa875b1e928cf4ef9bd22e7fb7c1e60cb9f8a9682381ddec576af20d6506b. 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/DEN962102960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x554dfe9e4710c9f6ecc2504849068af85337b56b4d6c5468909876b3f17d7786. 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/DEN962102970.
Bær (Arr. Knoth for Solo Violin and Strings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fe9d4c019d21629625ede9be2037308be9f213505a42119fcccd99dfd3df44. 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/DEN962102990.
Reverie (Arr. Knoth for Solo Violin, Strings and Electronics)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dc47c0e91ff77de9af297103a98c42dad7c0844d74c7523b78954586adde31. 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/DEN962103000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94b569895f4c7dfb8d0a91ccc855d61a65a7de4250fc0a03acabce8afbf6700. 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/DEN962103010.
Hammers (Arr. Knoth for Solo Violin, Piano, Strings & Electronics)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919967d2b90c466a08648225721fbf4ccefc2c432e996d7f1fff9dbd7d30b371. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEN962432803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599291222c2b04007b5f4628fa5d6c02f6a704b977a9f79f9aaba9490fc5c7ce. 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/DEN962102940.