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 0x25b21443b5d48689980773c206f98d72323c42371982c8ea372836be14342592. 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/d6d12df0-4a71-4918-a91d-131a2f83a188.json and https://artists.proofprofile.net/proofs/artist/d6d12df0-4a71-4918-a91d-131a2f83a188.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 0xdfb297c26cb4bb8859db8ad822168cc474636a18e553c5c93b71066af51d747b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USLQZ1201611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe3f5d3dafc36716846c8bb945229be3c2bf82e2a82820572690fdda123fb73. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USLQZ1201613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d68be9a92562ad35d63de188c32cd0abcd202c08558087caa717e41487c23d. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/USLQZ1201616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833402945c40c5d35e63ab7d11d23e1a1f83540486ac819467e32c7796b87734. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USLQZ1201617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5303288cd35c80a0e19a708fdef8e0bfd4bac3acba7efcbefd6575e992e022c6. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/USLQZ1201618.
Dry Bar Comedy Presents Andy Hendrickson: Left Field
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32afcccde178329b670667e7030ccf9132987feca7d3ddf400d6240c5bb015d5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHN62090906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2290612cd2af292d181c9e9b0a044bbcb50a240899e40339e681f224fcd64919. 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/QZHN62090907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1701ddecbe2c44c5877ba51274e09419933457e4c1506c0645f8d6a0e7bf280. 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/QZHN62090908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db1885838dbef111dc1fd62a7aa4bcdc366da65863062bcad553eb065eaf2c0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZHN62090909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d5130fa5e169c19755330d67282beec0414040be10bb0225c6f862b193c578. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN62090910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e347a3fdcb950f275e4071e9b1492546d575aab46beea6fa94b06e7ecc527b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN62090911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b2421516f25931e036cb20ae3b1bec6ae4c55e9a5a6be58d2bd039718bccaa. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZHN62090912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33edd783f0aa075bcb9e7a52a59bc0d7b2d89cdd89d88b4ce1f2c19acf8a0f9. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHN62090913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7344e68124061d179dfab9d7a405c55b16ffef5017c86c4f8b255e36d6f3d126. 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/QZHN62090914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826f676d9cdfe6668097c55e0c50132ae4373a58e7a3e9c837f3de8fa3245002. 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/QZHN62090915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006dafaad4ceef43d71bf890fc146834a170757e08090a791a884f0f08a135e5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN62090916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c139a9d86d54640df8e7a9a51a81d7faf603e96951b855cf9ec1e0a7fa4c863. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZRP42317217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf17ab1cc4b0c59df72dfb450eb8a6ae4c1393a554504e1e387241cf6ee5648. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZRP42317220.