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 0x2296eb8d1a8d7895f5730b9bfe56ce1ae0ce5e1de29c1e649064ae95f70bf905. 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/1cbe7ae9-bd1a-41ce-8316-0bfc650234ff.json and https://artists.proofprofile.net/proofs/artist/1cbe7ae9-bd1a-41ce-8316-0bfc650234ff.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 0x16f7b749818e0b6aed144ec9425482db466bd0c72b7cc5fc54b877ecae0c6be2. 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/USL4R2097020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f0062fe2a1329d1c8c3a975eedc78bfe330b63b56fd286ed7240d54cc9755c. 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/USL4R2097021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d650465f954e1c007e5c1bfb1f2c674d9f6bd562d0274f8ed785d36a6b4a43. 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/USL4R2097023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d349374fb300c94be5d163687b6f6fe02ac4cd309a3746a9ae90f345081308. 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/USL4R2097024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf113e30d049196f030bea988d0112e505c8b0028e33a5772b44cb39141f65999. 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/USL4R2097026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ab6b589904b530f78ee8549fd5e20377ca18206ca1e9922d5c9e020bc0d464. 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/USL4R2097027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9096ae120af406df8f52b9c2d703510f5d8f7790982e0702a13123d0205646. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:03:19Z), 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/USDY42441667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881ce2996753159832a779b854ba3042dd5924bdd6c16beb3b508ef00e1ac217. 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/USHM82342978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f77c8e2325a744889da0c0f6ee4196cea7608fd883c6733f5e0ec2278f92d25. 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/TRA162200575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0becd4d27547cb6ce5561881b97db7f9538f6ad5150a5d8ba45c51fe3baac4d6. 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/TRA162200543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2883c1c1a4d6ad64730d748c4dd75b0e204a4c1ab0e39b6721917325d9e53ff. 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/TRA162200467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c02747d6d9549ad58b873e5dbfb416dbf283afea1891f4f4f5805adbb292bd6. 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/TRA162200424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173ed3bfe16d200fa72479d6c1095fe52cf1706a19f7ca6ecd155ae5f80376a5. 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/TR0012100472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c609a854204f9160f0289b279ddbbfc9053975cd9ccc56b2fb78216fc51d9ce. 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/TR0012100253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f50d83ad26b4541e67c3d85386d56b7bf904146159d4b594e8e5599ec7118da. 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/USCGJ2115117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d2d177f07c8e97a3d2e75d04bd2b0f555198f43116c350aa18043992cdf730. 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/USHM92004063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a0a75f16c7621a74d5a2ef04efef2e3693da12de183d0f824f1d1a8b57c92e. 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/USCGH2047238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9a83e3ac31aa652514cbe300d639c878c792a9e7e5cedb34de40dd9e575f6c. 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/USL4Q1985313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48569fd69b6ca94d70c7e7afb31e0f39911fe7c625061479e2db2a0973eb0d83. 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/USCGJ1914124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb354a9a3b6c2117fc3cd7b8b9fca6f791fc5382c50e14c0406a80a84979f7206. 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/USHM91830305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f4a617de9ec5dfa3323321bcf7c7f2c23f8867d28caf70250a7e4daa1f74d3. 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/USDY41742528.