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 0xfb2748b3f4e4c2a531fe540ab6c3e827d018e5ae8e88096da1ceaeb40a74c9ce. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a30cafc-eb9e-462d-b0c6-7fd608bf2725.json and https://artists.proofprofile.net/proofs/artist/8a30cafc-eb9e-462d-b0c6-7fd608bf2725.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 0x8fb4a571f4592f140000d82502a65d544046b69db5f48c214d5748593e28eea7. 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/SEVWU1900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff7155ba3c68aa840018c91c92eb499cf6054f78fd989f880f3c0997e2e02ec. 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/SEVWU1900105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f426c00f7eb9b7f583c52cf8a7b7b99ba6696a18433c4bc3859efd2eeb767b3. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/UK2381401710.
Fredrik Sixten: Ett svenskt juloratorium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5fdc53fe33ace2f0550525bb9372f04103e72a051a2656ce47ba6efa436969. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEVWU0900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f64c0bcaf5555df941fc001fdc75aaa168195df8193cdb0b9a7c0047a864f78. 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/SEVWU0900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb850ee31149d21c73e340e14435cacdc555a0e1ec267343458ca7eed6d54001. 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/SEVWU0900108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3705000ea737e645db1c225d751e4062be1dedc5606b42f2666b128fc08dd284. 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/SEVWU0900111.
Requiem: VI. I Heard a Voice from Heaven
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d73daa7300b4691bc90fa28d990f6b83b40085b0afd3bec7af743f468dbcb5. 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/SEVWU0900115.
O magnum mysterium (Version for A Cappella Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c1b9888ff1d52e8b43463115be85fbbceaca0c915c7f6dae562e5af7ec4bae. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SEVWU0900116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a65f50f47232cdea5bf361892ee79eee550eaafbf84f51c00394ff244d34eb. 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/USHM81931516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6625570127079e7e68aeae01ea1a9ce5fd896595b8ccc99a8a6f9941c9b6bb9. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USHM81931517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc902a8b114f1f936f18f5b1ef59605c1363adbd948fb8f660dc220fe51bc418d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USHM81931518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa192f5a7a13bc8c79dbd2f40753af53459f8f7670b7272f7e22a4877e0b9eb22. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USHM81931519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3e872ad0733d93f4a2e67875f2e6b34e083920d3cacc5a8f88c2bd19fd4ff4. 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/USHM81931520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda45fb54a74f997fa41e8530112d6e3ff8c24b3e54378ea2ef4d2ee0adb9e0aa. 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/USHM81931521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71cdb8c1659b45f3c960241f451a58a8641422ea628b4465b3e5e20acfb93d4. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USHM81931522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37516da6e03888ca48cf6cfad1420583645e9a3e3c78a85fca360443ba88c22. 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/USHM81931524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842f6abe8ce07f80f60d4523427f04758388254207f049f2946a195a2a6c1d8a. 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/USHM81931525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a61cbd2a1acee052e306ab18ea7d254845ccde484d5f6b7401360fb4cd44084. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USHM81931526.