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 0x5923ae979e0ab72e5084d1c819b8d412b35f94b6e22a0627a1b918e707df1c45. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf658f9c-f09b-49f1-a2e5-b1ec7d47b5fc.json and https://artists.proofprofile.net/proofs/artist/cf658f9c-f09b-49f1-a2e5-b1ec7d47b5fc.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 0x664c8fa74e822fef79984a6a55ba24bd70f417cbc5c8bcf6761b1ac6004090a6. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBMCZ0601345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959a6a8cb207d258d214632b5c6fd2e3f7a71e680acb4c6722d9ac97d5e9004f. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/GBMCZ0601343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb20491738b96e903cb062473baa8df346d92704a4413aa6a67036be64bb63d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBMCZ0601344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664c8fa74e822fef79984a6a55ba24bd70f417cbc5c8bcf6761b1ac6004090a6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBMCZ0601345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0a39006cab22889977b9d6dc336c852890dc966d1c7ff8ea50ad998e361797. 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/GBMCZ0601346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e90495c18e7d1c481755351b38af84e3c73d35cce9f1feac144dd71cee5fc0b. 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/GBMCZ0601347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7418c9870908bdf5f710dc62cf9e3c429b2a7a79290d138eb55c3e497ca48931. 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/GBMCZ0601348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8abce5fa5c1b6d011501cbb5a1a860fd31c58b5e9f9b9fd3e05b6b08599b923. 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/GBMCZ0601349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d9357e3e443e6818cca188b4f012c66ca9a871681ee52fa631b1cfb0463539. 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/GBMCZ0601646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ffae2490a2475fb2b0b1956da11856de169bb93d8f84ba5386924bb9f7c413. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBMCZ0601645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d62ceeff3b35be2d1ead3d8be4f1053d6cb40e4eb607458455688731719f0f6. 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/GBMCZ0601640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec8958b6b2d111e3fd36a4d4bbac93cb248a47b5d4bf4603e7355265b67e4ad. 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/GBMCZ0601641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fa55df16065f1edb057363a20a9560b847296c152045621548f92529701f34. 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/GBMCZ0601642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7fc957d5d74e8abf273c372c2cab37265579e6bc2f0e3977bf3d3c83ade23c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBMCZ0601643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b73450352cc18dd280436402092d785d3c7d26ed26817f3e953615ac73b5b5e. 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/GBMCZ0601644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ffae2490a2475fb2b0b1956da11856de169bb93d8f84ba5386924bb9f7c413. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBMCZ0601645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d9357e3e443e6818cca188b4f012c66ca9a871681ee52fa631b1cfb0463539. 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/GBMCZ0601646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7418c9870908bdf5f710dc62cf9e3c429b2a7a79290d138eb55c3e497ca48931. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GBMCZ0601348.