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 0xdc2c5bcfbecc46f9d754c139d8a243b59c268db1b4afde71bfef65d985a41589. 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/3db38f96-951f-4adf-8648-8e1de5896a7f.json and https://artists.proofprofile.net/proofs/artist/3db38f96-951f-4adf-8648-8e1de5896a7f.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 0x5abae018831dec8fa64b4258ee3746801f377a290d60f2b475898a4e8d9724d3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACJ1587245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab491fc494c737fa92c444ac9793ac5670976564448168dc32ddc5379d18c40d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TCACJ1587250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ced9d54efe0c16f2998384f2f496a0587c4430847a92005a4c31a5d54a24e4. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCACJ1587256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa626e123296d7c32f7d6e36eeb8d85af01c1a6243a926c513daa945d240a54c3. 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/US9JC1548612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a5e20c5a1f066bad3d322f058026a9ca69323715808f13207a7f73afeeff55. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACR1631974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9f124478c27328b00876011c808c5c2395a9c2d39268ef12a517d35dba9cc9. 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/TCACR1631982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9312a35bff1ea61edea758a837b3152721bae1e81ac69c33c31017d19aaf054f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM24S1918021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87513082c51e61dc5b03249b16c761eb54edc47be724725d957ab6bd2b03ef1. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/TCAEH1909278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecd81c7cb02cdf7ede7b3638f41039254737984b43320ca78b21b95060df643. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM24S1926362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75adbe642991f945c3747a2fb0ec228db8ff848fd724170c2c3acbf614ec44e. 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/TCAET2010674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e0a716c1913b7e782a3ee07f45de3f367c1022d17a8b17fa131705a6389d74. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2103392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef6b8ba0805f1f8a440bb931cd491255b0634acc7d24e2b1692dc8c604d07bd. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USA2P2113822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f8cf249a00e8b87c3d4698aa129bc2cfff90ef6a5d21e34699fc067c49d2b6. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/USA2P2160363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb258ad4b690be4cd63b0715fb9923613863ce7ed9ac01e85fa90b5a764f8d8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGG2234184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8174f3dca78e268e631dac171a775b223820ff5216b1777199388a044a54a4f6. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAGT2377338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f3d26031a0338ed33c823609cc5019428ea476dfbff0d0ebe533c7722dd81c. 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/TCAGT2377505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbb2ef4b4fbd464825087b700649b62cf96da5ff62e6b8025e88efdb7542f29. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAGY2338909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649e80a93de96d9574f2e23adec9e3949d1e7db721c982c0c9b078e8a59f67ea. 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/QZVEM2327560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ea0aa34c5183579e6653a8620cd7b221c7675499d5dfd67857c87c366fa151. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZVEM2342434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a5dcb549780c2657d4c3353f19939f3a225a359a77f175790edac51ea74821. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZVEM2342437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320aa6dd94fede46259893413509ef45a0ba2d3ca8fa9b4e0d4fd0c233e4e85a. 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/TCAHN2342197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2007a15ac9437e5205f29844a0dcc42097f1d11b69049908ef8ee34c9a87951. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAHN2342260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed40c97989434d733b2ae996f4100d1022f3cd503d322a4e576ba0adc0ce86d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM6P42444205.