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 0x3dd309bcc13e16bb0d6ae156f634d8c6e76da3aa83e4f1221cb82479a3047183. 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/00d706d7-9df3-4269-89c0-735101337274.json and https://artists.proofprofile.net/proofs/artist/00d706d7-9df3-4269-89c0-735101337274.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 0x52ab69324d5f739f191c3948bf9e2a7aa9445f6c871f0cc68267e8cb45141e86. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/USWL11900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e1dfd62130de962d1140bc6b159c3f916e1459aeffe01d1f2864174d6fc1d3. 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/USWL11900306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2818dcdd7dcc43b9084c1c4143a36b06c7bbb42fca4b9ce800909f112865465e. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USWL11900333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f1e31674c04c6d726f3979cdf2994347b0360825e376bf12ad4eeb3f9c1fed. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/USWL12000173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470908ed0a2edfe661424bd1e70da447c85321c1a1bd85f4fad238ed34a4072d. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:48:42Z), 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/USWL12100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2917e92203c31e930c9b5d75930213eb24626b7997e9710a851f0b94a01e0746. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:46:52Z), 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/USWL12100119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889a0d64bc599de7c0403190433035a70434c20791dfd9cf80471c4040641e3e. 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/USWL12100189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf0e2521521832cb472474c3c8bb569be560b8f1428e77ece6d3b41e5016c84. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAHL2335422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342b869513fe7f3e245a5ee7edcefd40f4af4a0d62aac4d14da59b583418dfa0. 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/TCAJL2525772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fb5a116e83a04a1af2ea8ef24e3f4c130bbb14bd8e9ac5abb523b4f85502f1. 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/TCAJO2572648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e57a3f1e7cf541f122507913dd7a15df2e89ed71f6dbff47deac6e50fb9a795. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAJR2589030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c56b7a2868e714e291b857c49190ac822802cd04c95570db77b730f61494d0. 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/TCAJT2544102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7fe2a7cc4025aeb10a40ab37e5cf3a1035b06e25e3fe87b68f00652d3cbf79. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAJU2544115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dca6a991d643567f474c24ef86db653d051f41f292399929538e3b627175397. 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/MXF151900120.