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 0xa11c21fc6c47e1f215d5063bb943c4f934942bd48d19ecc473a4c66ad38fe0e1. 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/3fc81f66-b63a-454e-888c-4223bb4b701c.json and https://artists.proofprofile.net/proofs/artist/3fc81f66-b63a-454e-888c-4223bb4b701c.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 0x213cea8dd21ea534d975de72e932c25d38343deb3b3cfe71254cfed246f73fa4. 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/QZWFW2487750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffda419ecbf2ba88fe3c9db03f35b9cb4187dd2d6ac2f42231cbf9ce9062c4fe. 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/QZWFW2487751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60e3c41335d6b4febd20b0fe6ccf506e68967b40879a13c81ae642c65583734. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFW2487752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0876d28842d68e806e23bbdd6a18e284e500b542fabf27e5c240bfd6af7228a3. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFW2487753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f99fb4d169601464578cfd13eeb04dc53bb206d10d7c02ba72c9250b3b66d3b. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZWFW2487754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa232b596155e893c0ab11bb4ce9ab9668bfd61b24d3b03c7844917725dacf768. 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/QZWFW2487755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3091d9d12ce0b355efa9e68d140c3a00017f34f6808b81cb63fdc008e21ff46. 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/QZWFW2487756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e7fc351291ccf5dd48b888d0245f2be44c3821e8f550e32da5276bde503405. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZZ7L2402166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ea817ca4dab4d50a8b829b49473d32025733dd4e8715f2b57005fb0bc0bff5. 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/QZZ7L2402167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1128e6b448207bd23848e0be973c56ae4957af88edd1e7271321a7517c1f22e. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZWFL2460196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e4c1a81d850faea8e3dc92477b993178b2733672e4b065ae9227c11b10d4b1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZES72559907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b00b94caf568011c37f0044980104265095f6e4825e7aeb7d29359dbabc8d1e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZFZ32449678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449de998a016b43abf87e03c6288ad54a23ac79355f7c496dc0ee14f20844f20. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZDA42599877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60d32182f5ede3836d89fc861907391b663f95ee0993fc08332b69d5e05b2f0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZDA42599878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653f317b9b9eb4d0918f2769a7277ef72fcbd843d2cbd50801df94b504f5e539. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZDA42599879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edd0603350caf3cb8432a9987913de6acf3ea2fc7e5e4fd30201595b9b44442. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZDA42599880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3bcc83374c7a03c49aff7c1990eb878e801c3cf04e98163fe43200dab9a4a8. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZDA42599881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae2e614c547690e6ff937d4f225220bf59ac7e614ac8e4a796a4f4eb491ed3c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZDA42599882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e94535e6748101473dd4cf3c52f0b6b4262e3e969205b272d2ac71c56f4a65f. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZDA42599884.