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 0x1407b0673b02ee2509c850c0f5d23335ba51973f88641afda1177303771ec528. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88e94fa3-943b-4f4f-bc95-f0b74a2b7d15.json and https://artists.proofprofile.net/proofs/artist/88e94fa3-943b-4f4f-bc95-f0b74a2b7d15.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 0xa0bb6db9badd0de06fcceafd662b522411bc21ee95f46442500a17ba13ca2f63. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/ES71G2134404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb465b8aa2f15ace744c6bb3f1ba405cf78c60dd0b2fe2928f2a29365a89f101. 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/ES71G2144648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e590394599310a5a5d1f80d181b36fa5116b56b60cd8dbb6885494c5382794. 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/ES71G2221001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5937f7d47e4351ae7f82d39e8d16c865b7b1702f502e2883fa7a0f16c29c4cd3. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/ES71G2237322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c0d523e18449653958345fc07b1fcfa0b01fd13edbe37a0ffe1be9530f4a19. 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/ES71G2213749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c1f7603e7a170ef60ce900d4f4f7455dae5572b2ad39bd0d839f969a6a07cf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES71G2237325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822466d2867c203d7fc55709fcc645691f762194dca363bb3ec7567a7116bc52. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ES71G2321976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d4ab3731f67e61900e43315dc6dcd20f3f31d9446f01d9620e92a3165c2203. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/ES71G2417365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e05a98790cbce72eca1c4fe1bd7c6179e7fd53a093b73f4d585b1eaa4212bb. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QMDA62533211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c53aa9cca0ea8e974c49c3263e816ccd0e19adfe1d20caac0c00b04436eac4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFME2594573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7d10a2a06d58b69b318ed86eb2006ef5364815d70d77d5cb85d01d1aa0c56e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CLOB20700668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d7f814a44e06265f2c40057da227d72563e22969351342fc3d04c498b1fdf5. 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/MXC851600044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d7f814a44e06265f2c40057da227d72563e22969351342fc3d04c498b1fdf5. 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/MXC851600044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf229663e7555618a30234bccc5c86d88aef4699759c32e2066d70c54213afa. 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/QZMZ92571163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f57f6f45bf2454549c144f692b55a12944bb77a408814124ef26a010669ce2. 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/QM6P42538355.