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 0xdb9a578fd91b345df0146706d4bdefc26c7980613a2959356c2894495bf917f7. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1759e0f1-2929-4b3d-840e-0ab290f7c091.json and https://artists.proofprofile.net/proofs/artist/1759e0f1-2929-4b3d-840e-0ab290f7c091.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 0x77da928cac4c545a9b68a527ddf09fd8416af7c1fa6dcf6eab9c786cfacb3826. 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/NOHUS1801720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4da61b614c15a0965b52f1ca05c8613f5ccc91fa7c572168349fc059b9e43ab. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOHUS1801660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb3214c7348ea4b757dba4466ea66d387f8960555a108da70795bc504bdd3cf. 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/NOHUS1801570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449b65255cc6f8179eeb25a1bb3e0ea1257fbe5fb1206a54d721fe5e44ee1a0e. 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/NOHUS1801520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2112ccc2cb03260a5681c388bb5b5cc489de3177e38fa1f660be87916732030. 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/NOHUS1801340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ab8ca40f852dd82d383daac43efb1adcebdee27711e5cbce7ebfa441760cd9. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/NOHUS1801240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c696bd350a48aa3cbf5039fd73053893113806473880d9022c86638b89ac95. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NOHUS1801210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e63634e42cf3493f29afbadde63ad713cb115059f51e516049f9d89f86f9ed. 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/NOHUS1801190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951babf6faa6a540752603c88ee1034e845e50685c25de01fd899fd28a35fadc. 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/NOHUS1801170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4125d960a86ea722ce3404a03fc717d86daf3247a9ec423827c343b123ec98. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NOHUS1801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb62be2c525b1d6ece52508fdba7b1567852d3d7ea99da4184b2dd8496502a84. 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/NOHUS1801020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94bc7c204e3209ee5451329f424a104df0d64885c2489b61afff0bb115a3894. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/TCADQ1899958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a7bfdec755d1b75e921d2ce3004d7d7a80f60ef3bfcdd7f392bb855fa50222. 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/QM4DW1814492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7660fa6b862200d521635e3e71a9c48b4f748fba73383ff7d878c54e38d12e24. 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/QZAPG1811730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcbfcbc2f5dfdf5ac2bb2c8881d791a314436ef62727da2dcb3fa998b2a0c0e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZ9Y21740940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00092de29228c6d62edc0d30456f8c6879aa3a25e24140f40c7429df7543e988. 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/NOHUS1801090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f9e979ae438ce7911a861e49e4fccd982b3a3e2f6f1380d5c0486dc7d50429. 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/NOHUS1801110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5a5a8129502109fd62e5068ebc33d8c1fb41370b6202a335230476664c0162. 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/NOHUS1801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf6c90cfa9a91407cf131169c0846e4ae73f541d406182d1ab11979bdf22134. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NOHUS1801120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd1df8e931d3363f56fd99525980143caa73c87ba372f46af526aa9066a1b87. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/NOHUS1801140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9df1374daec83578e35dba6f292ae20868882894698ec41e5e0a7735d74bc2c. 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/NOHUS1801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293cf911345c1dcaf70926d9a2ca29300ebfd2ab0c885b096251dc5071483273. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/NOHUS1801130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b2d7f75dfee45a9b91ca7269ce2d60fa9e7f41139796df522cd46961b7a0b6. 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/QZ4JJ1952916.