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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 0xb172be1c89c8d830a96981a06579349428627d00426b2eb1b5cb8964ab6dbcdf. 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/d789051d-053e-44f9-afb1-25cfb5ee1930.json and https://artists.proofprofile.net/proofs/artist/d789051d-053e-44f9-afb1-25cfb5ee1930.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 0xf051cfc63c089b8b4d9f13f3c0216d1b58e189f6d5be77d35fcbb2ada4a90718. 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/QZES82076757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4f0f606aacb0901875a524c5d2aae34f99e4086ef6c0819728c252ca92a613. 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/QZES92144269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111e37701f736bb0e0d9185e44a6c3cf8d3b0e841c4dbed377bf2a73cdbd290c. 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/QZHN32159440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd720e7679523dba0cde83b8958abf2572da7798fb2b3d421a62960f5d2d773e6. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZHN32159441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e731b252324a38c70b01c75dc363e55cec3a76f26a3e1b8ae7f8d7febadc1ca. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZHN32159442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9da431366b8103b7323a3d88406de2823627c6501db15cea002856d84a8909. 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/QZHN32159443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141ef869602ab99c0512472e4ac5045aee5629dfb6e264d9137da7a95510fb65. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZHN32159444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba45e3d6942a0d60d967cbb7a11cf43a40a1ddf02efb155fc630e2bb326f6a87. 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/QZHN32159445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b119cabd51d3fe2421e8af62328006f2a63ba95a865739b1c4fccc036ce0a4. 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/QZES62345590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6b0b35788ec3f01e489ba45eb1e22c0f66076ff13831e66b99dd21cf8bf9dd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZES62350328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f50e0acebf9e0a673384b5add9ba9a040f3d05ae0d937bf9460ac3627f76fb8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES62350330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1ef18c018035cc6e13199715383cdf7c0ffeaf805251e333bff451ee49b977. 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/QZES62350332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b119cabd51d3fe2421e8af62328006f2a63ba95a865739b1c4fccc036ce0a4. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES62345590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49679ac07936b5da66dae2a7d0ada0610f9cdb6ee0c349ff88ae07e4917a9ef. 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/QZES62350333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a64509dcc61d68b2326b44a2bb2fa2996d8a6050f9f8ff711814d364e4e4c55. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZES62347582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce72bb20c9d2b0d8e4a5a1660070ba65436e375e4eef71abdd0da80d95453a53. 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/QZTAY2306543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6845eb36864be3c81897f758855ccf406530ba3c053aea588a90a8d77c4c8b4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZTBA2468305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4066166cb052f8968d8d7918ebb03347991de70e6ed2d716886ed190440d4b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6Q2526535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e3f276408a20f6bfb1d7ff04a170bf630f4aba15e2f7e16050fdae4a4a5bf7. 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/QZK6Q2526537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4f3ce1a3b31be5520f51cef5f325712c7bb7c4528ec6aa0f1f899b2e3cd5a9. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZK6Q2526538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cadd3f16db4e13a4bd1f28d6c2ce417b655806f09b8433a242189744b621626. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZK6Q2526540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e12560e82a0baacb7ae65d747e15f54fb55c256e37d2d9a5cf1d3ed8069047f. 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/QZK6Q2526541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef82b87dd22bc7f3e0a60eae99bb8270254efe9bca8281fcc0758be1c1bee0b. 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/QZK6Q2526542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5092ed10ee51a502e383fd9e274ffec15c67cbd208a2808b2f6fd9f3fa12a9. 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/QZK6Q2526543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fef5636b7aae54ecd69d4a7790b22a8c3de83f742cf637ac6de6a94d18dc1ab. 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/QZK6Q2526544.