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 0x18f22fe40794042492469a9f378d023ba034f1844307744c16f4bc55ee4a1639. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0b51e87-227a-4f61-bfa6-e304df49c63e.json and https://artists.proofprofile.net/proofs/artist/e0b51e87-227a-4f61-bfa6-e304df49c63e.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 0xd998c9af735168ab11d14b0bd807d1f35021052730dd6d8310be4e5a22219145. 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/FR59R1952829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a09a1ba4c39500f74d6bb3658113b98dfae9ca0a09ce39e670d13df56aeb5a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FR59R1952832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bf47b36c72b796bcd85134854aaf0b9bc956a26c04ca52d5c189789b33f29c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR59R1952834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2918cbf1905bc7774d972928acc2c8a5eb5fc2a0fdbc80603da702a84ae1ab0. 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/FR59R1952835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d40716d1a0c2b0481b871e3f1b206a48d70ad2328187cd7494070ba52f250a. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FR59R1952838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c8b41c2e279669ee6c888af8f70b9cd2e107eb23892314f1e900bc9bef09f3. 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/FR59R1952840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37db69d7fdac2fd51f7bbb5fe3464699f5dfc7743c8aa860372569fbcaf721b4. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DGA052077727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd106ed3a6ea5098629062a731b955d6c0cacb53fdfda70257bfe8e45912b141a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/FR59R2212577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe593d85f85b1ef629db414312e539c3cd2038d754fa4d65f94d4924b8ea8e32f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR59R2212583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b2b04a73ec58adfeddc754cd742f908b8885bc20b09ac5a86220d9c2ed7721. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAFQ2156068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8d23e9f6132126c4c31d9ff1a833260ed858c9bbc38c26bceb20a9614fbd74. 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/FRX762434913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f0402864f0ab25dc796df2c6fcdec8db7c29097020e82f87aa6ab6012d752b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZFYY2182031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602141099e81d981f814c88464821d1864deb63d455dd89ca593c86a723224b8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZMER2018279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4f92b27d10be7bb1471d8f73b0dae931cfa7a883e93863a4afc45e71998ac9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZNWT2488837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8a3c22bd492f1ad890e06aba6f9a157d31c008800ccfb73383b7f929340899. 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/QZNWV2293987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bf10068de3083d92c40184bf37a4a5a31ea48956c44b0aaf6a6c64d4607651. 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/QZNWV2293988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc434c43983c5421a3790bece4b936f6c733252e775695dbdbd7d2ceb015c7586. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX872373719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e5bfbad89a43491fd0890b9b2a9f9d0de1565dadd37c849b8e970254e347ff. 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/FR0Z50094800.