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 0x824bacd2f2f90c89febacdb10c98da5d340632c8939c489ad521787096f14bd3. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8085eaf2-9578-4004-bda7-b2e0a2c143fa.json and https://artists.proofprofile.net/proofs/artist/8085eaf2-9578-4004-bda7-b2e0a2c143fa.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 0x683819cf0af92ec8a1e299cf2a84c98f45c74523b4932651e46149ab6faae819. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZZ7P2471121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe83e3719a96df34de900755ad7f61085a7f0cc6211f4b7c60ad90cf0105d7c8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ7P2471122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba043784ea768ceb2d9c2313c5282c41c87d2b9ac4c2c1a6d7dccb4fe649ffaf. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZZ7P2471125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea20993690ba8353e552dd89402670563bd4b65fe50582a362d13f1ef031831. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ7P2471126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b09c45dd6428f1255e32d612cc29700fed00b8d510f74ac1dfa8aa07bdc332. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHN72573885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5243a86735b340a86d80ea91b6cea70a5d7e3b0fed623ecf19fe9dcf4628e4c. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN72573889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3838d0b36ac0d8c3c02b46de19c3bc5a5fadd11f0c5b6b656b2af81183cacf. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN72573898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0806f572313f8006a8940da6f529a9636406fdd5269edff3cfe52383f00e0db2. 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/QZHNC2590053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543c2ece6a2caf2b6dab989913b861dcf3ec2895048ff6134eed3d25789db45f. 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/QZK6N2555056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dc3b8c61284027f25aa3a3def811957d37b04716c7984266e296cc78e9abb2. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZK6L2506496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb8a35f3cb2ca14127ab517846ca774c78d655ae5b550c9702bd9bca81566ce. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZK6K2558983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808c75ff92f4acd42ca578e5368ae40f00cb4a3dab0e17455bafff858e6e2d0d. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZPLR2502441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fde331c133b18f949e60b29c0d88c294ce09a25efdb70eb671501af8ba0dea. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZPLR2502370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239db42fcf243ad372a21bbc06cd8c8caeba58d2dd527ae729fde2eb9ca645f1. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZTB52516629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55ea2ba2b005716c99beaa94213d64f2c85ce14227f064bea6f0f943d225033. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTB62530178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517ea1e4a28655ce60780947499d442451cd9a8205a3b097565b5d8b792a982c. 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/QZTBB2594344.