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 0xf81884180c639238f1d8d887d2f9a6f99f8799ad53475a60f57b55ae755d1a84. 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/29bf81b2-6a42-4249-8ae8-71ac66cc5188.json and https://artists.proofprofile.net/proofs/artist/29bf81b2-6a42-4249-8ae8-71ac66cc5188.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 0x72b94104532768b0a0d6446371b2d876b46947be5aabfd4a4c79249a3aa26153. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USHM91968648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8bd58672cbc7817fa0170c89eb2fb34f0b9572d1c17cad214f558b2c2e8a7e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USHM91968649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1891a40c3edb99529c2d67490a3d4f2eab560cb0cd6d80830266981a220a9d2f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM91968650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c467e8f1b6bf53f33cf850eef64927de34a2115a236af0c0cf9631db7cc6345. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM91968651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4faab2793a5670c236f8ae8d08d7fb1e3ad3caa5fd90a0f3e191c1f478bc70fe. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USHM91968652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf611f22737245a28970fbd07be24bed307ac6f1ac6c9a83b7086edd7912065. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHM91968653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0428a7d68d4da52a75271e165c2d87ccf255cdca9969e850e75bd9852fe6e90f. 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/USHM91968654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8963f0b1b55ee81b7fdae6b848196498565e6ee4df6b406a319e487dc46ef9. 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/USHM91968655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e4a447d1ada1c89057b1459b2f9cbd73857260961903203f844b578d4b9429. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USHM91968656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59e809d3352bc64b25e102088699c2b4bf0d1e57d2d1aa01453327a93c400fa. 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/USHM21806669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f33d124a57298de8b66373e0d583ec01a3fe1e34c76937c623febe94f0a76ae. 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/USCGH1738894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc276a4020134d0834b24671a48c13e0ee60a57190bbc74343fd524f81b40c7ea. 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/USHM21656107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce80f1df438b9042498a12250cc8069b64027c74e9955547c42cbcb4ede39f24. 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/USDY41695356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55670777084b7ca5900b81e6c410dbc9a653fe099c27efa59694c393db18ef1b. 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/USHM91302452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead406950eecec3e7b568f353b0b9ad52c5f72def794768fc9ad1487f8a91ed9. 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/USHM81338110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec404370d7cd8e268cb90127a1381596fcb4a4b207c0f022f97c509f9c57516. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USHM91302453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80899f325423cdb774739d39c6494df9cee3e9034c50d88c078cf11f3efc822. 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/USHM91302454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9265d93520e1132e9355cc04496a5d08dbc0bcfc69cfd060ad001d8204641ee2. 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/USHM91302455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77397520be54fa4020ad9064b676723e7473d2326cda23b170f1430a8098db59. 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/USHM91302456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead406950eecec3e7b568f353b0b9ad52c5f72def794768fc9ad1487f8a91ed9. 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/USHM81338110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4eb6b682438d0f7820bb4a627b1bad354df479ee4ed01ab8d4cec3b953053d. 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/USHM91098009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a4e40c1b6fe352be1eae725e22385ea753274783826f3d514a388fe74d623e. 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/USHM91098010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2a23bd27b8b3969dcd9688a546ae1798cca3691d0b42955c545c8053d84710. 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/USHM91098011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21dd2eac9d9f49ff449e9bc200a898620b79a92f06d4586a37f4546e4be31aa. 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/USHM91098012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac6adcce65e643ed6347a867a7c178dbe0d202fc631a0f8c737a330675c5cc3. 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/USHM91098013.