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 0x9c63b82d704e43492538370bd62608d3c5bcd526e287dd5990f3bcca09e010ae. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/728f1e75-179d-470c-aa5d-23326eb26615.json and https://artists.proofprofile.net/proofs/artist/728f1e75-179d-470c-aa5d-23326eb26615.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 0xa988f10c9b2e50f92490e863fe348f14e7f523ccad6beaba14c4924e7fad8a2a. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/GB8KE2408353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ea67e4393b5e5f9c651f45e7d6b92de0c3c72741257c9d919e45abd90e8f23. 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/GBTEL1800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ef4037e1f3729fadc21e695ee45a2a3db40fff6318ab13bbe2d6146e12e63d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GB8KE2408345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7d3ca86e58245f82406cd27842149f52de0451c34911336e2a56f73bf17473. 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/GB8KE2408347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ff236fd41bc92716e61ab716696643c10f6bc1a2196ccabb0ded68eb0ace05. 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/GB8KE2408350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb69c3d88a22081697d47982f5799f23114ecf0dfbc20f643fa39b53c334a476. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GB8KE2408351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1708a04aae17b3f3d25db7bbf671463544183573a6c878eda0ab73c939e4f2e8. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLCK41029084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87218ffca46241d12fe36fe5a51a62488da0ab96f395a4811640e38a3146e178. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK41029085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c55d86e504539e57ea5b6e52f314dee49baea11bfb593b2db3b4aafa6133213. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/NLCK41029086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334aa8a0e34dd821a3873cafffa9bfb03bf4d6aa7e1a52d23014016c5a343f28. 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/NLCK41029088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8845e949eb05b5cc425aee77b756d0db1bd43db43e817e94e005a5974db210a. 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/NLCK41029089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e60794c0f085ad9d445d76bb93d7d1fd70d3e8b6151b014b0a46591f39ebe9. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/NLCK41029090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb5970e5477b477eb17cd7d3ed561947207dd547e423d3a6aa36c4436e87633. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/NLCK41029091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d12879d43db83d85a0ec2bd8caeb24cef011b110aa1ef6b92a5f833fb07ab36. 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/NLCK41029098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73240ee1b63eb4da0dbdfac98fbab31c2dc32a792f496f6c215a9ffbf880e4a. 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/NLCK41029100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82c7015708a706730507b00474f397c6a6f889d12a003f47fe7a4114e28b65c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLCK41029103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95976354d8af105799490229ed6be821c7816424f48105036bf6db4dcee29b93. 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/NLCK41029104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1ea8b6bb8c18e8bdb4140c197b9db933ac92d8ce3b939996d76217f2146dbf. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLCK41029108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83086368095948427f8d370133cfbbf026093dff0ad5b0f834d010caeb12f504. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLCK41029110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edbfc0b822f729356a71ba928aec629423a2a7d0369e65d12807dc8d5d836bb. 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/NLCK41029111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9bdef702ccae0bfa4856c21329298eca91920ecd98af416e4649cd6ba68dd0. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NLCK41029113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe55ff61d0848e1d00af42184d3bb9e2ebfc92c21bf02de23abbe5e8d44eae9b. 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/GBTEL1800116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643b67a1e57a4a75222bd8b52d7f5c0e4ebb73c97fcabaf851bf37b640f09440. 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/GBTEL1800117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2640309c7d2e97ab0d688645907a8588923602db8b359db419e1eda6e06039c. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/GBTEL1800082.