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 0x3b3a8b73d07cc616be49f55692f10b8d3df5a559c9a5dfd63efcafdc39378c3a. 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/f24d94f9-f1c6-418a-b7a4-9d767f12e53a.json and https://artists.proofprofile.net/proofs/artist/f24d94f9-f1c6-418a-b7a4-9d767f12e53a.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 0x7533940d5fee89f25bb74c7193677a694366a89588b42edefddd71c8e602e38e. Chain 2 (Bitcoin): anchored in block 957723 (2026-07-12T15:34:17Z), 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/USULT1000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19193e54cbff5c3c41fc9d638ce8ef354d4ddefee094d8c931e1e6ee53d5a6f. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USULT1000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239b3171e5ac02c9545b4e82a21b7a95d5e2cc8440e1f525b2a236f12ffcf3e8. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USULT1000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6760f86858ee3edb381643cecc6f5bc26697a75070902f9f953fe063c82f619d. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USULT1000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f2e2f52f32c7116a41bbe26f0068298482f9e3fa215069500b77e2e11c1325. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USULT1200053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f487f2ef8a2cee20baf3877343885ee2b9451366f8dacd316fbc3a13c1e849. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USULT1200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c9e322b974863dba05c8bf20221af492e85bce23aff13025e31b204cd9c1b7. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USULT1200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb5838b175b129cac5dc6eb0e99de4a81e9f5ec8b0c2e80ce3f08dd7b6051bd. Chain 2 (Bitcoin): anchored in block 957726 (2026-07-12T16:04:28Z), 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/USULT1200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f76da37570c34b65fc9b71cfd124abfbf56dc93299a3cca5f55c01b3028b2bd. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USULT1200065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172066ec5c61451430b5c747c9816671a243e85bfbd1549c2a6046c28cad54b1. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USULT1300095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4657166a6cffe6f8beb650932c75b8acbad3b28747ab379fd8ae24c238371d. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/USULT1400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02309e6876270f44239c50cb73c1a54a630883765aca70892a4a703db24cc100. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USULT1400118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2c8ba4c8f87322ba4d5244a56b4e85bcb7aa27cd347be895977aa4d2084856. 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/USULT1400125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c814cee5d56e6faeda4f9c6f38bcf5f16a87fad74a16c2c1e5f5b669ba4637a. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/USULT1400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f1aff66c366b7185a9396002a0c16b5b31fcf1e365afe73f3e8b9cc7a3d0e8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USULT1400128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b6782b369d539812d9eff3527d50c82a14bf4870d2277882635d4042718a93. 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/USULT1600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ea43fcae35ad5ff02c11f5b51f806001064fa041ad71e26d97ea8703fbdc12. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USULT1600401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56326b1b25f51b80c8ec3def25b7c87d97df5d231f1acff986e586086822b670. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USULT1600402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c87e1562b268c0f2bdd2d305ba9c1f07844881477ece04543424160b935b5ea. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USULT1600403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2062b7dabd0a4860ef880f241c536b0a4d1410b921252b6da661db844f2191. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USULT1600404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dc64e83855bd3bffbc2192b53391fafee95665f63cb6b52623f2d7c2b829ce. 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/USULT1600409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc2ddb708428289c00ed9980ff28155de24f9130d1a259329db1f0b9ca8093e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T03:36:53Z), 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/USULT1600410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a3a5de4cf6e3afb6d03b75a2fa956e974b18ff40d79484513b1991801ffb50. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/USULT1600412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25960792b05c97edc44583825ecd14af45a32ee1e12db7f510ad4a6ac30ade18. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USULT1600413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb87fa44f946047edf4a6f9901ff4add9ea81b967428773a1cf9f938b6c2263b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZTBF2380001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e7ea85f0e9c9474521b6d592b902f0c60980593258e4c1b9b4937581e96b2b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTBF2380002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a88789554666d325dbd435493b79f625bd84e1fc53c66e7bbd974492ba0005. 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/QZTBF2380003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf03628d0e5f597d2ba0dfd06ce478ea97d2f39291bec4b22590e28c55c1ea4f. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTBF2380004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce86734d880c068309a48e61c7f521abd7c6be82a53dd6162f5c1c904609cbf. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:00:15Z), 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/QZTBF2380005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2d1fed909240d1b720ca58d17f4af276b1daab4bdb64e1a228048d09d8cd12. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:03:53Z), 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/QZTBF2379961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723efebf5b797a123e159ec2d2177822f4fcd0dda3a60d975fd4a7bdf8f23262. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZTBF2379962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3517a04ab05aae75694bd8c8ee62f635ac0623e103291d1629e20b66d0065d33. 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/QZTBF2379965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9168b78fd479e9fee3399cf6281f78672b9a7007d1724bffbf25cfb80e57e630. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZTBF2379967.