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 0x62f60ec2d99bb2449219daaa15cff821d9015aa191b1c43a7e16acc65fe777a3. 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/a1ddf783-48ce-49c4-af2a-d92f8a2e461f.json and https://artists.proofprofile.net/proofs/artist/a1ddf783-48ce-49c4-af2a-d92f8a2e461f.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 0xcca6d12c6b62419ae2206ca012520d766f3a72b9cd4fdc2ad62dd30622906863. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:47:41Z), 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/NLG6Y2200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb8ea5668d6f4cea6d9d08375e08b976721b50772e97281d19ae0b51f43cfef. 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/NLG6Y2200171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1bc2071376a1588c995bd7182abd2f0593c5b9d96c7b01bcf4620b99672b04. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/NLG6Y2400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8939e301c0945e2afba0c55f947ace606683d605a8ee1a54f10f604a4074f7ef. 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/NLG6Y2400062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef813063260e3ada41edb72f24151092d625b20e9d32fc2350cedc0a128dec05. 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/NLG6Y2400063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d99d17480ccc37ac16d6f3802d28c32f18e0f98e819f45306eb733b10530aed. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/NLG6Y2400064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5af4657ee8ae7ab2762a915071d10389b5c3eecfa4d8c4da1b81009b4d79e8. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/NLG6Y2400065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9649d660ebb0071863bda67f83562395ffe9179eea7769a53e2488d810410d. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/NLG6Y2400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde78004125809e546f10fe8bf477b139eeb757b331e6e4ff6f2d682a98934709. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLG6Y2400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18779c2516e3233addb18aa244341009e580e5b087764b79d4c2176fce5b726. 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/NLG6Y2400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d16800cb30567304d93c48293b6b143f6a3a3091a8cd457113bcae5034d7e3. 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/NLG6Y2400069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bba0dc6ec37468450226403f11de0233cb2a309055be07e7e945c615045d49. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/NLG6Y2400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61110dd7958312c17eb35ea8eafa4bd2ff47bdca315555d75542f42706686510. 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/NLG6Y2400196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197198b250acb26d616cf21999c55840c1bf3ef7f959cb376ff17e2c34633e87. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/NLG6Y2400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f24df075bac3f2ebf5c82a16e06a499e84e622b7e6281d8fc066827f7fac358. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/NLG6Y2500115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8641995e9ddb6e2b10e18807e2f69ef160d0b71ca1fc56a9d7a716e39416c9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLG6Y2500122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ae1e7993c4434c99358af0c8551d8f8ec59844975006cdc92493315ad7b43c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLG6Y2500123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0bc57a5ada3ae2bf0d9ef579f480525b14d027e043fdac6c82d2cf05e2b34e. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/NLG6Y2500124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70998c997561bbd85f39e3b6c462b4d77328bced5868242732eb1d5ecff874c. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:42:46Z), 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/NLG6Y2500166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dde9fc3b573f28c189d22494a610b2d708c6a6abe805e5f5f753d68afef3d23. 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/NLG6Y2500167.