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 0x234de9a061b1916e1f8cb8fddbe0cc7f28d02edea616cb78a787992f979f089e. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4a4b80a-2a58-4035-8d71-030068ed77db.json and https://artists.proofprofile.net/proofs/artist/a4a4b80a-2a58-4035-8d71-030068ed77db.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 0x19d4ac687f6d1319882f2ed8fa5b823620aa3080d67783ca180fae7db59f84dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32314652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7bbe79cd03100630ad4d90646c322cabebc681d45a1c7d52a3ccd88186e1f0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMEU32314653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2f8e569b10b7f1b9c3606e43bd8775e1fc3c354df5ba344b321106f489af38. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32314654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bef73bbf4a99cd012325ea12da7163c7868fccbc66f1c4c9dafd1acd34eaaa. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QMEU32314655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ff9ccecd964f62ad57eb9ee9d58abcb9bb8be33bdf81e45af8b15557a7c273. 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/QMEU32314656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef9fb35e87d2429adbbd021395908b4d92c09e3fbffa7e71f2eef1e1ff90cbc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32314657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa80af86e9a438c0090bc1759878865ae1430fee96dbb15ad6c947269917a4b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMEU32314658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a6024a4a2e58713f2126aa939f8c55db8418cf13ada06225726a49fee1ed83. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QMEU32314659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545abdf3389f1e55e9247f218eef687911c37606c6e0d3de605eed32e2166cb6. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QMEU32314660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef82d95e08a872e55df8dbf1e4196a3c8ee4ec59cc9f86227a75f233e639dc44. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32314661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188c81cce52722af22a22d860bf1eeeb40264572a6984cdeb12b40c1cba788a1. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QMEU32314662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8831242a3895f771a97032c0c5eb8d36fcdb102b1d3149961a8e9d4a2f758c1d. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QMEU32314663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5522010401760204a7078a5bc846b3a7a5789565e74fe5683ea44306a6152ab. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QMEU32021541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaeba0a870ff55cbc7b3201c23d95695747cc3b4a0a33725402bf0d5bae28bc3. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMEU32021542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd386765cce4afdc120fbf5d2a9cff2880efa82898a76ad688c208b27add82d0c. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QMEU32021543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32ec9117283d85e6998609ef9e94f7fc70a65458951f2a513423f68bebc64ef. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMEU32021544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c5c6a4a1dea1bc3b3d7a40a8023331ccebe3ab8eb8bc2ac1872a2af815ad0a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMEU32021545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16f4613d0004840d8660f9f822b5cc3df2ccc1ff86cb66e2dd9280a05609b2e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QMEU32021546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4ffb174e6c0e69dc0b4c1cf8ad25afbec48f35552b3b95b425e4a1c73edc86. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMEU32021547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6fc47e8c2cfc8551d33d8aba9c5b5e2ce65b82709cb67dcf7edbb9723b660c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMEU32021549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7bbe79cd03100630ad4d90646c322cabebc681d45a1c7d52a3ccd88186e1f0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMEU32314653.