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 0xefcac791383a4c8632fb11073d877c7317f8eb21ac7c17cedce09dbc1fad2069. 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/f15bfb1d-4515-469b-920b-166a1015f3cc.json and https://artists.proofprofile.net/proofs/artist/f15bfb1d-4515-469b-920b-166a1015f3cc.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 0xd0cdfb21b2598c7214828ddb2b753b2c10e156f24573396397ebf64d0f45836c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB42317790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1702148eb41f8a044e4541a81562309fb6642f51f0f6ea88b6db30881b7cd5e7. 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/GBWUL2489087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec246f3b9493eee04747f8c4cbcfc29d5be26cf371a41059e6d3df43012ca18. 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/GBWUL2489096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58ed98902f7b879b8deb74dd17dafa28d909a862c4ec5998511aca2c279d1f3. 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/QM6N22481645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32661dd352d0b37552fa5c93c81d3658e3ab53bc3883f2fa00b05d661178a397. 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/QM6N22481646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968659222b813493374d6eb0ab31ffa32b381d0753d6233a67f5e1116f6f70bc. 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/QM6N22481649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5aec4bb7e37e8fc295438bb2a2111a98eb0ed6b4c63277da1e3711290efeaf. 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/DEH742327471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5207ce5dfa487898437d709cbb02a4cab804217571cb5b48d725361d4bdf2a7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA82489270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad47fbc8ec91518d4b40feb6e3e0b2445330921e3d952cf18c311561d73077c. 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/QZTAT2368683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72d5ac72513bcd48854d466f313fe2bd77b694e4a571c3716dd42c9e6c3114e. 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/QZTAT2368684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17d2522898874ac582cfc3606f6afa15c50f33988b5200586d11badc4cac535. 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/QZMEP2316588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9266232e19eccc26bcde6c6564cc0e329f7cfa76af600a07372d79e3c2ffdf. 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/QZMEP2316590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a1de5c9211e4b19a9d20f049b6d3399c954ba940e4c2f9527f1870edbbe8b7. 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/QZMEP2316591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c47d883f305f3bf7db2eec16f44562f0ef21c3aa7aa0c56121830e7d9f8db9d. 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/QZHN62354521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ec6425dcfd7b458bf352374993bd6e1c53f1a47f64878ef3c6f085952a64a9. 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/QZHN72303572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bbeb3c4972ec0a293ac033365f0e53063dac17a3111dfad3a73ceb31b4167f. 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/NLCK42341160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7062f3bec217fce5e6c15a821f59c41acb131fb8d7d81cada40993bb64ba86. 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/NLCK42341163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1641339e51e021599c39b0050f62d45c62da10b2fa975b99afb8a133c9b79dea. 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/NLCK42341165.