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 0xf03346be3bd143765a779eccb3146fd451296551377db08949148cfaf26cc0a7. 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/5f071c57-be53-4d7f-9601-1e635a62b94a.json and https://artists.proofprofile.net/proofs/artist/5f071c57-be53-4d7f-9601-1e635a62b94a.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 0xed02b21b9e0e5d411f04a722a0637cd08588c7c51a18734314dd202bbe26866a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEA621500805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aeb853ab1c5cdfe4ba59ed9d8f5a33e4d4add808303efdfedb91e9cb5455ad0. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEA621500812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d706f3a6fc7380b18aaff3288fc93f2c644f6ff45eb34256aef636847ac9b2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/DEA621500814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73eced9cab5036c2013293c61bea19f6ab5420f044922dec361815b383aa9854. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DEA621500818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4ca27bbd637f7c2676afeee5a6ef4865c91100cdd489f7ca0b99a6556d8c87. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEA621500820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff22ce9e8775b82b2b9c256b267b39d08d362b51d5fae07f7c9cd11d8d42fb1a. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/DEA621500822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c097e8db50c748707142e9a080bb71328b011aaf37af6e850bfd5181d0757c. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/DEUE11713687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb33c3eba660e5c634f15851053764704f8429dfdfb980369e3e247962cfe26. 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/DEUE11713690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fd2b995e7087e72cb3ed22935c94d1fc7d8bd7015051d80053d73ae62d45ac. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DELJ81603302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11255f1cfa47be457c184f54a91ecf64dc26d07314d6ddd54f5d593f4559c965. 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/DELV41600022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d80e55d99d1d4f4c73f4224a27c7fce06d475689851c7e0cfec64cd214c9dfb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DELV41800052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3a9ff9f31cb9066c5f0e77af32b923c9ecc50437853943b99c3e5ae43d72f9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DELV41700067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505e462e1269b2171cf2aeeeade963211b4bde72524bdfef130c6d5235f861c6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DELV41700092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d5848839552446c69367e7a725fa54d78b4b12501c58eab84c30e89c56d9dc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DELV41700093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1acbfd90e5b1b046a4f16caea392eb469f19174e2dcb64e9697932538daa0cd. 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/DELV41700148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa6e011c3ad14c6b9d5e8b692c781f4734d38060b2d4064da4326bfb5f8156e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DELV41700095.