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 0x47fb98462a015d65a9fccba5b999faeb305ed898eeeb1b44ff930b3410290972. 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/5264cee0-4edc-44f9-bff0-d43ba6bfd7ba.json and https://artists.proofprofile.net/proofs/artist/5264cee0-4edc-44f9-bff0-d43ba6bfd7ba.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 0x51a570e99bf2cf7c7fdc7bd5c21a3eed7c7adb9884560014849c4c15e05134d5. 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/QM4TX2359230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ac9aba2933d78f962fcfbf5a733698980a093850dadc063c9458cfbafcf3e9. 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/QM4TX2359231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4fafd832db1876e7b7fbd41ccbced946f7f42ca53cb3367ab0221fe11697ee. 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/QM4TX2359232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b2794ba2f272c88dd67ab8abaa23909d1b78ce9c8cf7b111cc6f0c04241de0. 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/QM4TX2359233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa765793a47d8f31da82e648ebcc7ccf8d2fd070f6eacec241fbbc1acd79dea4c. 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/QM4TX2359234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0013a50401dba73f14a9ab684ac8ea28d139ec83fdb52246d2586e639a4066. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM4TX2359235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60750beb841063d06496073e8f427b0f6753704fcdfb488521aaf602429ed3ed. 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/QM4TX2359137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809fb809267d4147bcd28d6915e4ddc38f54172d94926959cd365499175b6a6c. 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/QM6MZ2307527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd4c5d55481ed8095264b834b01fbc4aacf9b74762c3fbccab017845fb679a2. 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/QM4TX2333553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2691203d517ab5932a1befcd4ce9d6873210dfe94766297a6f1af922036da343. 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/QM4TX2333563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c35aaf1618f3b53f64c84e3921f99f3880ea0858ec24e3612b7f6fd6e0fc946. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ZA78H2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f82a0a1b1697cec3c6ac8a8966bd96d0316f18edc5ed03d2b715a4cf48b214. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ZA56E2303670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2fa23229c59937caa230d3bd86e95e12d8002ea890939f3c3203635f537c1a. 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/QM4TX2368548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b2794ba2f272c88dd67ab8abaa23909d1b78ce9c8cf7b111cc6f0c04241de0. 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/QM4TX2359233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb871eb62d09fa8eb597cf3f77c3443464db528b384014992915937551f6fb90e. 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/USA2P0826359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccf9fb34b4e0ae70be50a047da9c766ff4b6145918f80c66b880d4975b6c5f3. 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/USSU20514400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fddf7b55c4b64b46b25a636141c6c8358274abd7ce10bbb066bf3d35badf61. 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/GBERM0200703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa564877fb6748ff7bbd97aa5ea0edbae46f40cec0138900cc94905fa305ea1ab. 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/GBERM0200601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2492750b2e1b868993818822f093ab98a814cdf52e023e5c50f56800e9fcb141. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USSU20106700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61aff1ae922bdfcf67f7c27b5ca4f1accc68eb9463e64f434526aa662a1af1e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ZAW781300063.