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 0x94c73b41c3e08e661c603e192fa0602f2da9c4d405a04db1c87e9554b65824d3. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99bd50f2-5cba-4b25-a7ce-aa1c71383be5.json and https://artists.proofprofile.net/proofs/artist/99bd50f2-5cba-4b25-a7ce-aa1c71383be5.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 0xe37e644dfc40a8743916b0ea6f7cdd42c9063d37412a0471e702f841dd4bf361. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/USHM91977806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7c0ca97e6de998c1042725e8737c786caf47bab4ab6446e3e1a617ad0c06ba. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USL4Q1949690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072690315d01d4472d260a108b6b43ca867873f0b94902a2b4ab3d5081420852. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOFVV2063030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b031f70e0e0a84ba7373b30d04a8744e62c0c30e5614ef205aacf91359a088. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NOFVV2063040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa9ee2b5e80c8b9f5f3e3bc7ce36422f4f1f260c4dab411c70da13836a49f55. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NOFVV2063080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bd343686d8f778e9c5b185f292ab60bb57f1668f65ccc6233ce3d5fd27dbac. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USL4R1912210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0d21097f3f27f021a273a4d285935ea3fff7d5f41c3e4f2e488f3d52283116. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NOFVV2175010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b98382c4ec09fe4c4b60b2343e5255f8f1ba4c33de9da061e4bf24b860e30f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NOFVV2375020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800469ee60eb524f501e5c6190557c368b3069324286e1dd005f095b6241b74b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/NOFVV2375030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e08876f526ce21bae82e2abc13099a4e042efbafbe954982e465c628b903dd. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/NOFVV2375040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fdac387e1d6b413a7194a7da3f51bb9a1deaccc713a9cf2b11ca154448cf6c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NOFVV2375050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe1e1a6ae2999600eaee6272e4009c3f63bfa056b85a7bded7bdd302c2ab871. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NOFVV2375060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c877fcdcf124a2a3fffeaca102dd97e3edbdefc1af496e27baf7706a9fc464d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NOFVV2487010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6565fa3d723441a4f13778a70d362e4e446c4ef8f3d5454c053af90817c29f2f. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/NOFVV2487020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45198694f493eef995df114e82936d75f69c24344a0a6f284c7cf97d317082e0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NOFVV2587010.