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 0x3ec91a446f647070ca710c894fa48b47c0c74192371f0fb2fd728e494a6d6700. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f33a204c-87dd-4d0b-b19a-9fb6be230418.json and https://artists.proofprofile.net/proofs/artist/f33a204c-87dd-4d0b-b19a-9fb6be230418.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 0x64f375ad25b6fa5a0ecf593c5960e74b5f6793c0509399c1d9eacf189091e977. 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/QM7282463567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139eb2a95d4b7fbe29c3303e1d4929a817a157eef105082a9f52d953a650a9a0. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QMDA62335765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582509871969cc12818c6105d31fec70825778b4f4b32b839eca1ea558d2ebcb. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QMDA62200992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b7f6c8fdc53fc2887c310d61e280c3dfe72a00986a29f32880ab17662319f2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZDA52230290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c12b3caf43e29c8d03ba4817ff3eedceba3ff10341bf5f38c014cd9a0c42de9. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QMBZ92257350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57bc12f525de16d925208461c32a85c30b43f244f3000189940a7ef5d63403d. 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/QMDA62201033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1543f2403eebb9eb9129697224a705b0d4a72d827ce21c786a07ffa34fd435e7. 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/QMDA62201052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db005f5a07e73694e745a84c264fe23f8de0443b7a9eff7495922a51671dcd0. 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/QMDA62201051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e702599645b911f37c7b3157c723dabf8fda2e6ae0ac89a40217cf258d0888. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM6P42216138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8f5328fee3966523d171743c7daab557222dc4c63c92a9e065421736075350. 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/QMDA62201056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0595ef142788d71e1a292eb5218ea1210fed728d11f6c7c3debb0048829946f2. 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/QMDA62201063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088157dbd73b24e11602ed19effefa075c573a9f77a0ae4643a98471e99bfbfd. 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/QMFME2460356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc275db25f10aaf4a85db72797ebb2d64fe424517bbebeb962d3e350b5ae5ecf. 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/QMDA62486007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052a187ae2a8028d64ee41503bfe9a9e4f45a946a839da48f7e4797ebc2b6746. 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/QM6MZ2538124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba37ac4874b28f4dd7f35e11def6172446bd3b97344496864dd9cecd8ab1299. 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/QM6MZ2538153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0456682e2ae165a7235e27a42b642bd6b9f85751bf19a368b1f0ad3ce00bf46. 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/QM4TX2570669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23983e9397aa6085b0699fac0b5e441ab428c27f245d09ba697d8aad395b9ad1. 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/QM6MZ2538152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc275db25f10aaf4a85db72797ebb2d64fe424517bbebeb962d3e350b5ae5ecf. 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/QMDA62486007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18e6ada10173bab8386de3ceadec91f796d4bd784359a3c91c9e72bbaea7627. 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/QM6MZ2538164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7728aec664a6ffc584df28b462a4f20a54261690c9f385ab9df72c329770af7b. 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/QM6MZ2538167.