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 0xdf839480dfa769ad2ff83f70bd0d3ecfb46d3749608eca567d3ef6e2a95e3df0. 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/47e85714-cdad-4b9e-b83e-4a4b36b7dcc2.json and https://artists.proofprofile.net/proofs/artist/47e85714-cdad-4b9e-b83e-4a4b36b7dcc2.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 0xafcf24fb9bca607429af4af4d823ae6a6b55bc6c80c972d21c32786fbe78ecc7. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/GB2LX0900093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2594cd03856133218844f392737b58616353de475068a18ac0a5b6e559e225dc. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/GB2LX0900094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1e1dae89e0c70d40063d9ba5a821dd082ef2f12678830f39e0ce51803b518b. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USHDH1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525c1e4734a8cf06ae296f659d81db7a7bada3a711d7b2aefb31545e227ffc4d. 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/USHDH1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2d2ad7cd2f5ddd9dc1fbe78926295a90658584cb5d586909603e60c47b0748. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GBMYF1700128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c82b13fb58d949ad65e7af1b1ead6787fbaa511172f0e350163f2ffcf51502. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBMYF1700131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c52fcec372489f6fe6ca0a6a382e0fab04c1203f3f2a8d5a165dc7fa8f3862e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBMYF1700132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc95d99ac25ed85b72d3d9d9d75b077e5bcb35b3bf839645c5bc6d6e08a995a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBMYF1700133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c10490a13882f70cfee40796de819147c5eb51b6d5c0b30a9067206a164d53. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/GBMYF1700134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe142f1978d66814ceab828df7869a9c64d6156bb51bbbe783e20eef2b9e772a9. 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/GBMYF1700135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c171e3a07f207625d9bedf551c40f754cbf1989cd00c58896fcdb38de8bfc4a. 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/GBMFY2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c678bde5731b6a8c5de42921e1b5b9f1b5fab0d5f9c2dc9bcd272b5d79e8777. 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/GBMYF2300189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50ad7fec242e6d8eb49f945c95670e9798b19a0448d279950c4f35832024ff5. 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/GBMYF2300188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec22415c9f3a97fa8248841d7672bc3e8b0234f58f67628d0079949cae7ba726. 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/CHA832196211.