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 0xc70fbfd4937a3e995a51dec17177dd00bb2d8189222f9847b375be3953ff7a68. 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/4d756c96-bff1-4272-ad71-cdc5efe7759d.json and https://artists.proofprofile.net/proofs/artist/4d756c96-bff1-4272-ad71-cdc5efe7759d.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 0x313f067687c404640c82130d65523cc4b6f0f305f9b5ffddd61575615276777c. 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/CA5KR2470702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7238d53c3834239a854a9e97743def43cf9d9023f4444f15793727b1e9327ad. 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/CA5KR2470703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a455ac6683c0bc67e7cbdd205c8f6925b16a60e068ccd390e35864a04f4f8f3. 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/CA5KR2361173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19b2dca89cdc3404994efd2b43193cc6716e8a041dd2a660ece1a4df1a8e775. 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/CA5KR2303829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1e9a1928eef775f5948ef2940ece093f5dca8acea2adaee5bb2341e70c4da3. 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/CA5KR2152414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85dd7643ac85e7c6fe797a5a359661925196c6d108d4575a15fab02c0bb5726. 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/QZW9L2362456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd6cdafdca6e0c9463dbd6a97be6bc39a24d2a0940ff6318e8df0d07d39ffb3. 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/CA5KR2319163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c62e88bc21e4d1ce16eb8b5c355373e07e08b59815c2a64599941ea27745601. 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/CA5KR2301880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136060db9d76653718a09345ed6e8cd6afb1a0f5cfc72abbbb3bbc5177f98b02. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BCX4V2200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1d2bd80306faf8d599b84bb722f2027d20d3e24d8ba6a56d0c072f87c7c1ac. 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/AUXN22120901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4239cd3109d46375bd07e7a5742d07c97437a28695bf5a701b6ff066ab011f1. 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/CA5KR2120498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1722902f3c2ab2f003e133049559fe028aeadaf27495255b5d2f4f00e1ba0f. 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/CA5KR2063962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7053b59c4c55b95123f4fa427fa43bddcc7407681a8e25eb9c4428ed27d0d3e9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CA5KR2303845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19b2dca89cdc3404994efd2b43193cc6716e8a041dd2a660ece1a4df1a8e775. 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/CA5KR2303829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018c31eec244fb23574d69514bb29168f7fbebd01f3ff69d7aa6821cdc7732dc. 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/CA5KR2379149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec52601d5ef3062054304b8b8024df9b4acd4642fe063f5d655fc76bad8a9e6. 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/CA5KR2379151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8ea7b2fdb8483946b7c22e56ac2ecda44006564bde8a8d86af3111d49825da. 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/CA5KR2379152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a4e5a53531795f78782f9e2305da67c35c40594766478609cc55c624e35440. 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/CA5KR2379153.