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 0xf1ae9317d972bb01efddcf3311315b5e91756711a60007590f41e1718175aaee. 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/0dc42e3a-cc22-48ca-bfcc-86ec743e8f3c.json and https://artists.proofprofile.net/proofs/artist/0dc42e3a-cc22-48ca-bfcc-86ec743e8f3c.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 0xceacf5d5aec25005cd6ec07ce0d38205a0828e5633727cc55b2cc9a4c90a2784. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/TCADJ1746350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87743827993f03235718245dbe57b796ea0bf7b384476c668c7df1929d89331a. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/TCAFA2055927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd553ada2e0aa3ffafd0e4b2a73ac52d55eea94ae79d4f9ef656465b86b4a1e1. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAGB2294356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b0d6cef87b714860ff6dd7929dc8fbee5820f8649f101ecc248e3909fdbce5. 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/TCAGF2215181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415f31a55498bc31467efcc2a2b90c0ea849cc4f1e7c77882f82cb63e5222ba8. 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/TCAGY2324122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2453438b9aec30e6b31303ed1ac47272359de7d8a19486933e4564246b286715. 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/TCAGY2324132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0bbccc1a25cebc8582766ee07e86fd4a15524eeb785e0e5b9b85703cb14b59. 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/TCAFX2103730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d869f78d06c484210370bf80b003fa50663c28ac6070c37fc43fc3e0236784. 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/TCAHR2333284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b32a5d0718d04370886e881034d6b36f488b9bcd9441bb52be38b3499961ea. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/TCAIC2486111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38f2a0562da95f240ae0b9b7f0352d852607bcc3da5e8e3dbc765d6c4d975c5. 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/TCAIC2486146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542cbecdde7b3973099ba06f6eb32eebb4a6685bb2f908aae56c519facffc5ca. 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/TCAIC2486156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2559e573f08026c746d339965a820675ad2ab08f76c988088fbb1cb24172dd4. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES71G1705209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c102248fe6bd7a5c550e4d4cedcf36053ed40a9d1a97435d940bc6ae0f9b3e8. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/PTBM11600113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8999b6b5424bd7d56f5a61e4ae39190f4c410dfcc8a6bdf705683d6bd9e23bc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/PTBM11600121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01405432921eef6a5181014dfe20b37cbf7f2f7b63ffdd9732b922e93c9a9354. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PTBM11600122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a9553bad17bd7a3b5873edda0837618ef51ec3597d79270bb2daa3f0c9c3fd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PTBM11600123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4c6b3e3fd4d58cfb57f3b9072d92e25e43a19b7a449dd05ea7eba2847f3eae. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/PTBM11600126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04730e5e457f7e560b3e43a8b957b4619a4691a92f349c3e0a3bcf3f2418c26. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/PTBM11600127.