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 0xc2defece10543b21a03ab9c263a4e533f294e51f8026d9e25a046cbf76ca8d9b. 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/3d87a2f4-88d0-4e3b-82ef-825a506c53e3.json and https://artists.proofprofile.net/proofs/artist/3d87a2f4-88d0-4e3b-82ef-825a506c53e3.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 0x0ff2ddb626bbdbae5d877f3a56b89f6a78f96135708db6ddb8f59310925a0596. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INL239000445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce8c20bad19a7eb30187ee764c444abca3b1b4a6176358714a8c6acd5f4fd18. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/INL239001460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336abf509891371574cab5f91b7cdeae08a61e4d7ac9cb8076dec73b143f56b6. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/INL239002828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87556b8b4cac411da76a4ae4a5e2cb394c05c0c41eb488f22df691e4fd6b5915. 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/INL239002823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c979e64bd9f478d3ba100a496df8bea49d0f71cd1df75897a8bb8b8698e472. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/INL239005710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1418e79f73184c6493319214a9f289ea4a53b8fde349c158b02d19705690358. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/INL239005712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fcaafb1b994032346512f01d7f080dc9ab1d033e92691ef9b0206363cbb9cd. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/INL239005899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91362a351e3498fc5c1b495d0bf6ac8a506d840b79c4b2dc3c703f16899c759. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/INL239006992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027110496ec6aab3537b255d1dad9a0e5122ac46a2c28911473d60802c44726e. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/INL239012838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027110496ec6aab3537b255d1dad9a0e5122ac46a2c28911473d60802c44726e. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/INL239012838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621d2d55c87f8f3bd119b23d0edecdb5902e0b56b2f289116a39ed91921f8072. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/UKXN22267270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e91793a524ca5e0a1337e6bf09474844769b8708fe0bec9edb5d2a30e062070. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBLFP2248893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18bf861987588127f986de6c3c482e03f715c6e2caf7063aae4bcd9e76d590b. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GBLFP2248936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4627bf5c555bf7bafced75324cd5f9b1b1265a4a8e56bad9a81ccef2f5a3cae. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/INL232455328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bd6f390b1c71a1943b0469dfe6c54c7d3165962b646b585225d206938c6ead. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INL232551712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ad09c65458df0d57468549fefda73af85cbe0cd782c5d3ba20a798662bd423. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/INL232551797.