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 0x019e011504ced86799cb94b254989dcd7b624a70654284c7a98679fca4a33aa4. 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/e1b7b147-1429-4590-b984-65510acca5a2.json and https://artists.proofprofile.net/proofs/artist/e1b7b147-1429-4590-b984-65510acca5a2.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 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 0x6d83a95307a4148435fb9964bb816fffa1bbb937e0680135c2835a3e1a95e270. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CA5KR0000943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8beb5a813f30dba225afa9b6a69bc48cbeb338c60b5dad8ad7100979b6f0d44. 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/CA5KR2379148.
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 0x1b5bdf030256f68c5b4fce2bdc604a977163c6ff201a21400ae1f9f89e0b3a28. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CA5KR2379150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7345a281e8c7423a686ab8d970a7929ac88ea173b3be65308bd9f69c51ca6ddc. 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/CA5KR0041859.
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 0xf4e69b121b54f16690136b19fbad61b54fdc5acab0d8435b9d1a4db8b22d3dce. 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/CA5KR2152386.
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.
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 0x138f7de725838d737d3791dc7274019ec29d8559bfcda9bf0ca33566db3f648a. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/CA5KR2152378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56043c44b11d1ace68f1693907f16bb698143f414c7915ec370e8e0ec6071bf. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/CA5KR2152384.
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 0x6feae74e39f83a4e3b7babcf9b4ad37579d50e0e05b6aee046d2ef8b9631467a. 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/QZHN72031472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486377d5657b54ac121b916a645c62801ea3f995c930955218df0e14a211d4ec. 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/QZHN72031469.
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.