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 0x47c24e3084360236d24509f8f0715052ee1df41f7be0dfa2ea6e3ca41add2e58. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4a5f339-036f-435a-b7cb-79d154540437.json and https://artists.proofprofile.net/proofs/artist/d4a5f339-036f-435a-b7cb-79d154540437.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 0x775ac8fd89558544493d2334bc115220b5ef22b7ed310f8a3a77914c6a0d3308. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BRKO12400242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3dc93449907a778f0eac8cea047c948723ee839a6d50df8550efb072b5ed2a. 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/BREQP2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0c1558d83b2f1a12120f294db9475819b9633121d343c672dab8a212bce6a9. 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/BREQP2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff971f6bd6b5feecd86bbe97f51957b012ee693bb7a2e0e305ebe126e618962a. 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/BREQP2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc926719fc51324cbc428cd3a2c1398b75e5817c44fc1fedbf41eed83c56c0c55. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BREQP2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4d63cabbc486f3e0fa74ef3cf247d9662bfe93e9b8c6ee19ac60670e80ded. 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/BREQP2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef95ae25c21413921a38ebe5132c872cdafd445f06f10f858bb12088735593e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/BCK9F2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe368535b51c86bcca85e7018c0a4af1bc554d8d42cc8961fef19d287b5fcc3bb. 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/BCK9F2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fdb18aa1036678ddd01403df871e32c50493f5b78ae68f76c3b7a54f29d1ff8. 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/BC2GB2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde54f148e5f5c744218a061258f6af2d985ad1292c798404a49a71b95ee7e191. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BC2GB2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9ee77ae1f626d8b7c30f1a428f8e40501f21c6ec301ff1a134e61d909b1b1c. 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/BC2GB2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01bf210a4e55e37828750b19728fc40e43d574c12ec8c0320835be0fea173d0. 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/BC2GB2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16fd92101057820aedaed044580a695bd033ec6e13bfc75f9488450a4a60f4a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BXLN12000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7fa4d331b3190dca14ce3187e34803f5f5820f665d93085c154db984df77b7. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BXLN12000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4913824cc453dbdb2f381887bed7c68310fa55a7b54a8eb494feeff27891a78. 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/QZGLS2024932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd242878f18115f26553c2c660d21a4b84794deb320c74bf1495057bce496efdd. 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/QZGLS2024933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414208b435eb41d024b635c535468de301d6aa3ddca38f79ff5c6e1b26045595. 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/QZGLS2024934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59fa72a967b72c662368b4085bd5c3bfe628c4a02468786ee60d40b0bcf491b. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QZGLS2024935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79466b1ce0555a43e4da5d71d9dcb1800d46ce69a5cbf665202c63cfa6c44785. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZGLS2024936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4fdf1116c5a291dcbf9f17c9fda95efa70465aab07fe6b3d336f80d08722b3. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BRKO12400271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24affe7f7622942ef68d7d3c4a2a07e058e0d92ecf432443180a62bb12f7b9db. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BCK9F2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbc0c361ab40b1f4247d0a295d80bc5a8aabe89e18422cbb9ed5bd363460611. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BRKO12400642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07af6bd86b39403f71aa7466d1f3314e24a435c0d7f8cd1399b25893cc46021b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/US7VG2112075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc8b614d0a6fd7af86faa7a7441467d32ef73c9cf794bd97bb523ed8888b321. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BCK9F2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0753e3d5d1427743da512afd65fa2fa4aca11fc4b161b26a0ea05548f986fc6c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BRKO12400641.