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 0xeca8023f9600a8cf2369a15e15e8550855b88a206fe93d4003ac76a3a7c3ad56. 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/30e024c1-0928-4369-a17f-3e57ebe27344.json and https://artists.proofprofile.net/proofs/artist/30e024c1-0928-4369-a17f-3e57ebe27344.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 0x6a5f9576f409a3606998d13286c59004db3a2936632ba3ddabe560dae6913fca. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CAW6I1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92f6b76ea6423058d69f83edcc1eafb501087b1d3b3fd43a77914d3fa072015. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CAW6I1600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb351c59fa11401449176bcde0efddfab81a8b6d5f9b35d652bcce524df5763fd. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/CAW6I1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe5ea70506174355407cd15dad89281d87e7a9b2718a7d1e61409e397f18706. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAW6I1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d910a244cce333f492c81185b12885083227b7b5dd3735a0c87288111b8a0f. 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/CAW6I1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85010c244016cf1f1eac8f40535923bde891eb136ee0b00bf598d5a3790bbc0d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CAW6I1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476dfc52bc0288228ff315efd3457458b9e5f0382b9132615395d26108e35f6c. 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/CAW6I1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309eebe32150134282b14c213ade8ab7870bc6d2958a37c980a8566f505ae01b. 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/CAW611600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5890115c8bfc784be384fea10a670918805e5b246dcbc8f1d0e1cd78c058ba5. 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/CAW6I1600023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8653c04525cfe202cd8683d7d3cbbd4c995a71d9adfbddb8486a996c33e97738. 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/CAW6I1600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624e207ee13e38b6b1308b0abce217950e633ff9b67d3ffb5c72212b9ba7546b. 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/CAW6I1600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab645a72c3ed46c55ed5f83b3b30e50034a474340d5385f4af42ec9e12c3a569. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CAW6I1600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf20518841beff7ea988eaef1b449fce9744096f67939312a33533bc371edd7. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/CAW6I1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcb65dea8aae2abe536685756a9aeda34fedcc7059a9a4686b86f4b28bfaa47. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/CAW6I1700042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12926060c2bbc8958833597c8c4172959c342f8413c75ce5a96730f34696908d. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/CAW6I1700051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ccd4ab88674e72d02b73dd857638ebd262429bdf4c1312fefbd418acbd88a02. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAW6I1700053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaaff20f45892328a7e37f49e413b7c82c2998378cd0ab1fb54703ca753732c. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/CAW6I1900059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbee7a9b4f4c4ca59a64dca76766eec06c94a01df3e7e4e3ee6ddf53d87261d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAW6I2300011.