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 0x0e2ed3a55eb8bc994469dac6691a575a4a971bc42b28d8971ade07ed45a50594. 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/6b9e1c3e-167f-40ab-a4f4-193cdb148b24.json and https://artists.proofprofile.net/proofs/artist/6b9e1c3e-167f-40ab-a4f4-193cdb148b24.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 0x329f4942bd7022e334afbf085588f49d385f086df0dcd1e06c6d6628f04b1c4c. 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/USCGH1795740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0de74231176ddf22b611b38068da57c4db751fc0a167e027313081fbdcf883. 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/USL4Q1704588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143e383d1b5a8309e294611626086ad57ff3498a57cb34f017a383fc8fd96528. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM91847414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329f4942bd7022e334afbf085588f49d385f086df0dcd1e06c6d6628f04b1c4c. 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/USCGH1795740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0de74231176ddf22b611b38068da57c4db751fc0a167e027313081fbdcf883. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USL4Q1704588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143e383d1b5a8309e294611626086ad57ff3498a57cb34f017a383fc8fd96528. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM91847414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12caa37f9a3ae830bee1b2f75a55b8307a08b9824542810953678ab49f8fc72. 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/USHM21991312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa099e69cc6c6d6922d79fc578e503b1d600ea2e3398ee1345fa1d7ca9e5b3423. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM91919395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2965a52ee83f8d72ef2937df2775889f8ddede4ea8b47c145a4ea12d223451. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM82012906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d1cae8f0b09eb1eae0ba835fd862249150dc1dc5518c7472e534f30b7652d3. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/TCAFH2010276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecef4601897f80bd9f59ff49c33852618af0f848e821343f966d3100a765272. 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/TCAFH2010281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca9c28e2196dc342f1fad83e6dac9bb0f34f9a56331f08605285cdbdc8f4d0a. 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/TCAFH2044606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388be03d2081f5e328569ea19634993d675e04e2cef676243c00af04c8afcea6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/TCAGC2220274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcff3226e46d5115a4dcfd5aab6798efa8e0a00d4df4518c805d0f489eb6780. 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/DGA052217951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9866005d5897d94045f23a410d7444a92411f8b07b19a81d8dd8430eb5cd2124. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA072244255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a014111b538c5b02ebd6e2b55c5b5e9dca6f08b416f2b496eded80a6701b4cb. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/DGA072244259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5cc1fe12cd86c0c2095811c0388ab48c4b3996471c8b293cd58638a569b47f. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/FRX282346415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9b8d29d5045a87471bcb4adce77d6a37230d345c3189484c6d1d35e0524568. 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/FRX762391811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00b93a0cc31d2bb2343a0004a7ee6331a9edd62412dd0b172779e1d0b4a3036. 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/DGA072339481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5e24cbbdbcabbba116ce9683d4f3cc9d423fbcdde0ae8bd65da4ebb7545e2f. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAHJ2373428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b0396a5e82cafd78897dd084838db8222af09af9f81198b0450cbaf2180d04. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAHJ2373442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a68bff265e47b03f8020788d42b1defa77f5ff8a11de8d65570a7d550fc512. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCAHJ2373466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ee76e95339f66162a38e81805fee22ca8827054fecf6c724f9f982aca4560f. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/DGA092377768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e44e6f6a7bde0fb32b1456ad0fe4ae7d514b70dd362e7bac05a28213da5221. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/FR2X42477645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ada65e09e12bd9e04bd79da090374d44bcde1fea4e095b705d419ebb74ca930. 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/DGA092432303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ef570197ff2fbaadbe5ddc7fc6e42c4a4b3952483c85a346070664ef301e6e. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/DGA092432305.