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 0x76771715b395f49221ddab333186dc7e15babcc336a093c581e06fd70d345d47. 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/032896c3-da84-4707-9f8e-0703638f7ed0.json and https://artists.proofprofile.net/proofs/artist/032896c3-da84-4707-9f8e-0703638f7ed0.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 0x3bad673085c4ad0297f92bf3f4fbc73860c4e525febf006fde756d0659287540. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/CZA231202347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8840caca22d43c596ca2371cccea214ac9198798832cda5123f19001e968b5. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/CZA239700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9b1af28efb9e607077f7900a4d01ed484f54ee7058d4208e30d2a795bfe1ea. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/CZA239700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e51643ff6a37159c91b9f2e008be2f35dce28d62a33bf9f0cc5d4ba0ff650f0. 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/CZA230800346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169c9cbf6e6365c45d49f04ed2e4fc811f89b93d7802817a1c433ddc9e21ed8b. 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/CZA230800348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dd285a890a8016241a68592b08401a2dc875349a088444cb53c425ea611284. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CZA230800354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5c777471f16cb62ac4da1c9f0372b061c88aebf52046a67f5ae9665559b094. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CZA239700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4dd348a48cca92f9c98debb3537e51df34e1f3695e5bc0e8b3e7cc2cac9adc. 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/CZA239700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9b1af28efb9e607077f7900a4d01ed484f54ee7058d4208e30d2a795bfe1ea. 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/CZA239700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d7e3e64407336319265aa120730db5278ce3ed00be989f10ce5ce21470450b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CZA239700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f9cab48381c5d8abf6fc16a0e6365293bda97c732ae003a76a2f53ac76857c. 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/CZA239700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0d39c89f7726a7a24fc94543d614342b3ff0ec2c9895c179fab4bff7275473. 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/CZA239700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0692e3947d175323954e90d179327474d3df3e3dcd04f4bfc931324aaf336ce. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/CZA239700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9471c468c6921a55f357ad38ff6f5c06f16612a0af6d9b5be117135af37968d8. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/CZA239700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8840caca22d43c596ca2371cccea214ac9198798832cda5123f19001e968b5. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CZA239700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b3980bc46ecf3917e20539b1192a33d6d3354aaf3af79d31ec8226e0e8e6e1. 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/CZA239700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5eb4bf19a71dc37fa2dbef2e9fa1d72223948a4e3f6822434fc21053404e611. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CZA239700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4199822abf5b68885faa4d6349a2ffde5004e01faaf3b5f358b86efb06c0a8f5. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CZA239700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf51a69d42e84c0c055ab5664a7e82f6f08ff4fb42d489539be88ad080f42f96. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CZA239700016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b9bba60aa1a8879233c5bd404ca9faf4e08a118bcc7c3e1349d2fc1f99fbab. Chain 2 (Bitcoin): anchored in block 957676 (2026-07-12T08:20:25Z), 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/CZA239700017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab49acc1900ab37a7e488d4a68e3ab0520cac251f44d6764647e9ff18b8b830. 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/CZA230500616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85598b7ff9aa84315373a03b608336314ad7d5232e461a93f85c246cbcc5e3f5. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/CZA231202282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ddc323265c24a42fcd0229f601ea8da416a2d16f57566b572843eb7c308e3a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CZA231202286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdc044bd2d5a01862980af0b4e2bbdf53ff767bd457a43489419db357abbe86. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CZD712100147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623711aa1f206848e33304932bfbd0492d7e4d392228af8378c1335af9c5d268. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CZD712100149.