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 0x97ed366505bdf3dbf80cdb4315c7dc771b439eb7558d177357415554e7eee2be. 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/cdff9864-3720-4dfd-88ca-6ee4a3af55e4.json and https://artists.proofprofile.net/proofs/artist/cdff9864-3720-4dfd-88ca-6ee4a3af55e4.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 0xdf084a493b9bf410cabc46e70c4496f7a338b96b910c7162ac86e4745f10d303. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/NLQ901100044.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82664cb894e77347cb6fd4fe3eddb8dc8796662015246b6b7dfb6d415aed9c27. 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/NLA6A1500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf67a2172d89c2bceb287d773042bfa97c93fc218d7a38abfd4e62b3fd49b96. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/NLA6A1500077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288254b0691d7b4fc73069e17dfef4b8dedbd316aa8933d278e4f8c1adc51f8f. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/NLA6A1500082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad5bd301018af7026fe2396bd1787cd94c694517f2a22f880813aeb8837d6be. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/NLA6A1500084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b7b918aaefb13f8e8bcec48385f758ad5b7b27b40a693a00700d1748b0f631. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/NLA6A1500087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279f63032e19f7e494acdb2590499f0df430c99aa922ab80b337855de4ee23f5. 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/NLA6A1600091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f7e2e2288d472883754f53beba37da0a7ab492b31224677e56031d0de1510d. 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/NLA6A1800114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2293659fef7dde2451568063a5768a46ea736b1f7762ac478fe950bd2e5a3c. 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/NLA6A1900064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54fe99c6735f533b6fb1141a6428e0ccb0603c7297755cf1afbbb2828366dc2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLA6A1900065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583334bedc2f4cc0f67e722edc24bf112091269e5d3891222e4c07f3da5dfafb. 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/NLA6A1900066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a050dec4f46d6d5023147411fb343a42caa4aee3e19b842c710745dc4383fc. 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/NLA6A1900067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bb4f248ddc0449504fb07474ef2dfc52c9ff3abae3ca9143448bfb4e652569. 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/NLA6A1900068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9d10f7d6df01aa33b68b055d099fc65338ba289e92a198ab06e0ec90c63ad5. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NLA6A1900069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d3e48aca21b930b6bd5932e5854952f4477a23a7cc375011b7e806ea5af877. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/NLA6A1900070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b06e358c9d99db288fee0478f7968a10404e936e44a93bca4d21d7a76624e8e. 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/NLA6A1900071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d024dd9853f780d0fbf54aee997089002ac483e717c2f8539fd32e731752fb. 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/NLA6A1900072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50114dbd3795b1a04f32a11af3afda3d0b4ee1568a0ba7f672f03452d018e7be. 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/NLA6A1900073.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fa94d307613d334076997d710e8cde2f297aca6710468f55e250501b357136. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/NLA6A1900074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6207f685ee941592d3185e6a50589e4b57db80bafcf1559a9dda4ac7225801a7. 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/NLA6A1900075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdd059f407c03518532f1015f36c5562d0aa501930d5e1ac52d74835a5377c7. 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/NLA6A1900076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3c759e9b11b01575ebeaaacc7fbb015913b5d4fd7f4d5aacd1e5f5317e571a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NLA6A1900081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7c703c5771f4246d2f2b97d1dd6d3ad384a5a6c71a0eb762912690e03c1c9d. 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/NLA6A1900082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4410557d4edad3449434cbc7dbec1e02a9d30f4b90c57c0a031ecc99a544f44d. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/NLA6A2000232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c7b752980c2b60eef7a438ea513ceaafb95756c317c44cd4b502030a848b19. 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/NLA6A2100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f8584f8563564c46ef3eeb208bf68aab2acd88632ac9efdbedf3d8ebdbfd11. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NLA6A2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7147e543250f2b16c597c751b6d6511e90d6d7db6bc7445bde2c6f7312859461. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLA6A2000169.