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 0xaf77351067f6c45b5bf284edca362ca24ffbdf42a9011a5cf246aae7515c31c4. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68b22271-dd2a-4020-bc12-15779c5d3c28.json and https://artists.proofprofile.net/proofs/artist/68b22271-dd2a-4020-bc12-15779c5d3c28.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 0xb9daf1647079aa898d2d440f794cc3d1a0c0bf9ce7222f21966c1de29756f13d. 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/QZTBF2335608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437c412031e8f5fbcca56c6d4dadf70fb68fbd89ec2c7f385a9337ccaecccf61. 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/QZTBF2335609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848bab822a2f872dc3f569c0d1567b4d52e0332e758411604360529e21a47ad0. 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/QZTBF2335610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ccdc9f8ce38b3569a5e48edde096e3993257108d6a092caa4ee3c0ab4ed7faa. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZTBF2335611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3261c87a5e1c637553138041c8baf27ef3068665006ed501cf225084f9ddfc. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZTBF2335612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac22d0c0f47fde61d90219b544494d44be9f0ea8392c993f1e15c1104f6135a8. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZTBF2335613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71312b7f786f57ca21301a2723b47b57302a69f64b9ec1ed6091bfc579dd07c. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZTBF2335614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822a9a2f80a47a8c4803f0094b8c57891d51ccb90fd1c61a0ba7515f2f118aff. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZTBF2335615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34f679a52573532c2f5d5738fa0d5420e23b02ed7b654fdbde7464ef045a5bb. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZTBF2335617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48682ccb9fac2cf2be1b94e349c0817fa18bc07e68468c90c1b493754c9d931b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZTBF2335618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630ebdaf83e64db51275697783a4095d04e1a22c0751077db02759980f0a4876. 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/QZTBF2335619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa776e8eab90d39ab86c9d8083fcfd86c30688b03fa5e6716c7a642ecf2adca. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTBF2335620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c03031e87683f988b5c0f80f228d5b763d33966b9b735787098e6f875332bf. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZTBF2335621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae606a391195d25024ad87feb5c003ca37bc1804d07bf5ef400ce5602d8824bd. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZTBF2335622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0bad0047b51ca01afd996daf6fa774743c2a1421d6f430722e6ca02109d63a2. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZTBF2335623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fa490fa14044281c31c9d0ddd6177b5baeabf36ad724a3d0ee31b2a8207777. 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/QZTBF2335625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c95036caa59663b7f8c1b15959554bd3f6f41c829ed715c5f23578028d7f77b. 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/QZTBF2335626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4765e23aacaf3ab730b72691aaa75f7173f39c2d8e52caaf42faa6aca3f465e9. 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/QZTBF2335627.