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 0xa16d32966e0b45f278a08be02340110c3d26b02abb0e0109ddd99782dd3b2d73. 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/d7f57c23-b832-42a0-9420-a24a7e20768c.json and https://artists.proofprofile.net/proofs/artist/d7f57c23-b832-42a0-9420-a24a7e20768c.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 0xe7ebb48c834b124a0539de304b224c626f247b465933b2033a0677a8728e3251. 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/QZNWU2378112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa042e7190f3251ef14a1756f10357dc839515b77ea881701fdd649db71cd3a57. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTAX2430266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd241a187b6399d2b627fa6d223af26d40f88867b181d68ffce2258ed357929. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTAX2424302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8aeee22f535bd995ac6c1de24a06879908c4c8d7eb375584e8ee0440a577a52. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZK6M2418849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab401206541be00b42c8bf510412cd19f24baaa7e928dda1d7be241a6ee0e8a. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZTB22467223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1ce878cf2b6e2eaf85fa666ca6d650acc5a556bc9c4494a2535b6870d668c9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QT3F42404789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d75c230969e802a3cd03cdacd4c70f8495dd6c7811c272b4a904427377cc17. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZHN62568313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c77abaa97089fe5dfd87729156f702b305aa796b88f2ccc20f7892da732b5b3. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZMEP2531580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d454d68948a9d19937be58bf1ff073f8d8f65c0d799c72db1a3e216fa23b0b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWFG2598290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ef2326ca963149da3fc04ab5a7c7381c17fb6ed6520a0fe339e7c0d061ab89. 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/QZWFG2598291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d1ace29f4f5401d896cb0ea2e62cb8f6c88d2689e7358e29dad5a7edc99086. 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/QZWFG2598292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67649911c3702b05ae8f6b12b9f9abac1ee1e421e1bd952817db4f2c6819068e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFG2598293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6c0f334b567e5fd40ee345dde037daff2a15ab803978b38dd58c0afea65d6e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFG2598294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c77abaa97089fe5dfd87729156f702b305aa796b88f2ccc20f7892da732b5b3. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZMEP2531580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa558e57c0dc17115d45db8a7f77c6f47fabfce1dfb2dcccfc6d4c236e1ffd30e. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCAGF2297157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882d953d340bd1103c47c11865550a45b23739c0ae10527eaf8c423de855ba49. 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/TCAGF2297230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65c5547212efd5c8b0deb3327b4697c74380b226dbcf1ad41ff02c6bec37a16. 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/TCAGF2297265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78784ab3f740001fb9cc610a68fd4b83281138c8e672cd5414d0a6c80c64492. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USA2P2458209.