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 0xccf8a6be47314ea608f547496132034599814fab54e7fcdd34a0bcf66175d993. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7722553a-f1e7-44d9-9654-15b9895cc52f.json and https://artists.proofprofile.net/proofs/artist/7722553a-f1e7-44d9-9654-15b9895cc52f.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 0x4f3ef2b5ce19aadc98cde59357a9202c391167989d612a87aa319d64d8bee19f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLL6R1600117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdb7ea99ad6304897cca4869f0467e4c76d3429e684a44f146fda9316a3e4af. 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/NLL6R1600118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220b989ae7d763a945ef7c25dc5bdb45c51ecca443f014f10a5722ca0b725b25. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLL6R1600119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab365de99908b02774a7a625f1cd94c119fbe8f624ce569987b2556e58994c92. 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/NLL6R1600120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b936fc93cb923c8ced2c4509e623c4652899b42721fa226ef8910ea0a528da. 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/NLL6R1600121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baaae98f8f9e280cbdbc05965bd09963552ec4a2aa41fd15d2da23ae1718b0d. 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/NLL6R1600122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9df2756384d761a1d1392408fefab2ba3ab2d6b1a08182ca56c9f7e2c3d6a6. 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/NLL6R1600123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ff9fb719495e4f2eb3b124acbc2be8deffbea73aaf7a7dd92ae713518f7bb1. 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/NLL6R1600124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fdde0dba9456a247284264f717d831f4524f95bbcbb25cc03f71b60a8170bb. 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/NLL6R1600125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fbde32e8ce210a9a7dd1220bd7f03720031c1d1e3a99165592d84515c0f2f0. 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/NLL6R1600126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c3d50f718bb9992b075440d0250603cb128097cdf9173886fb0753ac9d72f4. 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/NLL6R1600127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e97961ba779d4cbf91c4e8363b523778ce92a68a6c174cb3dbbf30ec8f14f47. 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/NLL6R1600128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7353b2020949f257cde679fa62c3c1e7613ea1db4bbf5129b4a801d34eaba9. 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/NLL6R1600129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c783dc26911d401a6b95147a50257d37112085785a6f275303a2a409a6808c. 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/NLL6R1600130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc9be3e2bcefc53bd687152683c4bcd37b9277e5b0b031afe2606c605a82ef8. 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/NLL6R1600131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c17c6cbe309bf487e32fa509623beb71007538d6f8fba645ebc3e8ceae54bc8. 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/NLL6R1600132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5c2865030718cec487b1bc059853487ec92ae6c70eddc9ce2423f793509218. 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/NLL6R1600133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc3b0cdaddb284ee2ec57de88d4d8ead69ddbab555eb56ccb6eda5e78ebf217. 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/NLL6R1600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900c3a91f11bb7817da8967280bbef825ae642ba2c85e2a0d90a4351757a680d. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NLA521503908.