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 0xd15a2b82b49143169870ddb4955cec6c318b4795830b31a187d900f24ef2a4e5. 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/062cc012-2a08-4434-b235-9277701c4f69.json and https://artists.proofprofile.net/proofs/artist/062cc012-2a08-4434-b235-9277701c4f69.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 0x1c1e12fbf6ae4407315689a118fb1a6c5a961ac272e805ce3e298752958f3907. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNJZ2344934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68a569e590c02d0d9d25c672ea3f91946203c862a71bcbf41891db072475ea8. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZTVM2305086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c45e9d48c054ed152f92ea9364308d73d77b2c09e8b49b136e33532704b83ef. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZW9K2343702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c563d72bb8d6df98ced38cc68ba468565c8d4c36971f8e2abe882f2787e30a4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZW9L2345956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f71780d526efb324f3a65d2dadd7c7abdff2aabca26a278d07a59a379410a19. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZGLS2468105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9298d875dfc8c805a2dc42c00796ecb546685d393737c2ebdc269265761d0e95. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZNJV2466118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb690034d91fc6c2d90eb5cd7373d49227416742aa4daaf9d660d155f3bd5af09. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNJW2446846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa9d5728f7b92cafaa8a4888cc32fa19eeca39f5cb6a2b6d082c31e74a88dd0. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZWDW2409883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d862a521a0a8b9d9a7af91ad5ff38d49da50e2eec51ab7979b9c98a52431d78. 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/QZWV32456917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb4df9842830e3515f0545ab9afaa0fd8a007d47de6dea26c7082001a9c79f9. 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/QM4TX2529399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf46c565ed82c466b36354f5873578316ccc3ded5c9cd6fe80a83bc15145e0e. 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/QM4TW2507029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbabe991106e1226e64738171ad91672b8f2bbc78a1423213c21dba64ba7bbe3. 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/QM4TW2509244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb004b515837ba14a9b453bdeb30e842a671e78063f09ca452dae3234af1aed12. 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/QM4TW2507013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b8003ceb83217633c70cbea4533b74866528a61bf91b5143433d6f12ada31b. 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/QMFME2476001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8eb7e1574b7022aef3cb3c79571b9f20f73e827dff8b4d1e72fa02fcfcd80ee. 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/QMFME2435573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc0264f3870d5e14dd480df6f808b9366170aaf72036d75dbc92742247f8d0d. 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/QMDA72495697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042887d97574570e621874e3de913ba51aececd526baeecbd9e0880b410818df. 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/QMBZ92499834.