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 0x5a69275ec9106fce9bd34831af7119c656008e918255f983b01b49f0192d3077. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d2ce8f2-296d-4642-a612-ba5b6085f1d0.json and https://artists.proofprofile.net/proofs/artist/6d2ce8f2-296d-4642-a612-ba5b6085f1d0.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 0x0bdda9c0b9bc2dd43b6dd2e122646563133dfb81b7bd75a4b83a455ec0e26f67. 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/TCACO1609907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a5e0911608b16cfa67c0e6f24b1c9d2787120f3573627e726b7aea5c02c481. 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/TCACO1609911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2029334de01f73190ef02ce50db0b332487e66888e5cacd5168bd4f06923b3. 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/TCACO1609964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99700f7ba272eca06fa7900cc68d079a4c92832d7417e9fc43f0ea3449d897ed. 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/TCACO1609965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05319afbab2b32ce2d4eccb305e761d072ecb66d56d58caa16b95aaa9aa4904. 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/TCACO1609967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3638df3b823752edd31dfa68c6bc8c5359113d91947fad4fb4e41a40e0a25e. 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/TCACO1609970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955daeb4469e479b78d3a9c264f3acc9c0177e10eb3b0a249ac0fa08e6ad6505. 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/TCACO1609971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9d9f41a0e99b79409f320f8be64cd921e7c7605ebe4eb1e64bd1b5ebaf1b3f. 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/TCACO1609972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1760f434a79a7c900f314f3606b7a08dd4f4de7585bc6157e4ba8e37ac503aa8. 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/TCACO1609973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5016926e0336f28264bbacb795d2a71a4dbc5926adfc5f860cad1728f7a1cda. 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/TCACO1609975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd59e4dc8789f4e8fffcc09e3b847007d6f6d249918580bd8045c82b1827f863. 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/TCACO1609977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a8090df36e956574168ec6372c3391cb26f3bf2c73a4f7b33f9613e04516f0. 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/TCACO1609980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa2014a0ccc427a45f99c3920b9ba286238d543b1678961371ac9eb79de871a. 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/TCACO1609986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3909e3ad72498da074e74391cca0ebf607ff442c1085e8a29b85d2ebb26044c6. 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/TCACO1609992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bdb9f0bf316eb5bcd44e30af223caaf485c3234ae8658775fcc0675f0e6e63. 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/TCACO1609998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabd302ba408a3b396198fa976c56957518da0dd459a94dd7cbeba528d1d5258. 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/USDY42402703.