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 0x1e3702876a53c81b3449f91812d40dfa0161e25dd9adf784d90805698dad8956. 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/5aabec49-5aed-4bd6-993e-16cfe0ff23d4.json and https://artists.proofprofile.net/proofs/artist/5aabec49-5aed-4bd6-993e-16cfe0ff23d4.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 0xc928d5664ac838053d98f8df2691569f0b296bc571f6424dffe231ad18fe9429. 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/US39N2304244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441b21efece2c15d31454f0609722470ea935b246c76d6a464908c67ee3b8558. 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/US39N2304246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2af3a7fabdffb11697081910a744e0538cf6a14fed708fca362556bb3ba211. 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/US39N2304247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f288a245c7cdd452ac5290dc65fd4a679d1dd714b184e76dccab5efc86907a. 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/US39N2304248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf58062ae3cc0f8dfdf4aa7f36bc992a932188f6a59f84d9543b08bc9a30b4d5. 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/US39N2304249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd207b266bf43f63e213d52173455a1b6d23207d1dddd0969e0da9d1ae858c29d. 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/US39N2304250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886ed99fe5d39cc14f4b9c2268d10a9b81bbc48f78a765f452e246339f1d0b4f. 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/US39N2304251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7a8db181c965a28ae46e367070d09b8ca9d75a2c2cdc500bf101c48689a927. 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/US39N2304252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137e440d3949794daea3400cb4fed29e3194b8bd25a96c4fc1d3e705ebd81b0b. 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/US39N2304253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ec3d5840714f8db9909dd2d793a35f0245d699cab54c1a0c8600f368f63a96. 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/US39N2304254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319456caba155845faa855234aa301a3ed0f921654c85d9076b2bb760cbc6c78. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/US39N2304255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7aaa89ae1da3cc9b406acc5ec3b0254c54f525ce9503b37c648c47c1b51108. 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/QZEZZ2200337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ea29bb505f2c42c45f4649e109d93370927808d2a6aba7a509c77b23b70099. 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/QZS7J2111438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7aaa89ae1da3cc9b406acc5ec3b0254c54f525ce9503b37c648c47c1b51108. 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/QZEZZ2200337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb509a4a13605950a08d80b9a30dea54d102abb0d40fb9b9c9a09f351f19d93. 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/USUYG1462644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d1b2ed6d88f5b305abe814f7c06f60cbda7bf4b1994362ffc5f3b5c38b6e66. 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/US39N2304332.