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 0x2be424e5536185b19d7cd59c0bdbd3c2927475051a7f4998d0da4fdc6f2db274. 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/62f077f2-b835-4a8a-9739-b5bf43fca154.json and https://artists.proofprofile.net/proofs/artist/62f077f2-b835-4a8a-9739-b5bf43fca154.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 0x9b821eb49b136153192ac91b77a6b7184d3dcc8c3b8015b45c4b0c5852c57970. 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/USAKS0501859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8f326a3baa536375cde843e32798f9b0dc12368d24b2973c6245609fd6c56c. 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/USAKS0501860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa79f34b943d717d16417c924eca682d5fa20d48e90e42451607999f9225cbf. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USAKS0501861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a53a91f49fdd09c485325504f73a777bde64350d0b7e027c69bfe4bd42304b. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:29:46Z), 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/US4R30602330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734281aaeb8b0d0aed356e15e31a97dd1b0399c8212c2b062bd233e3f06fc791. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/US4R30602332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f02325c22bf292fe1462dc7dffa8cfcfda1fdd2bc46a605c8916c9f87ad80d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/US4R30602404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674b73c55e445ca28e9dc045189a1e537c62f456f7c434a03a4383e08e8df95d. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US4R30602406.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4679d2d4630ea47bd43e2f5c43ab327f2dc1525efd566730aee0de1676479f18. 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/USKHG1500111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8748228b950f7090b6ceac13c341233380ce8e23f3d3fba4c085813debebb742. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:21:09Z), 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/USNK50805001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8985d61cc9c3443c2f4e731893ce26027e93ad782ef9ba278a0472ea564c8f62. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USNK50805006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab54ee6cb399dd4f1295b83ba87a3662e953df7659dfeb57ea2b4f068a1a989. 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/US4R30622924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486cd921799840b285761c6cb6deb405d477a45a9692d4bde81074dd4578262a. 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/US4R30622926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71719860de9446fc8829666544cd0b9a084a8195f25c7c3bd557af784412b11. 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/US4R30622928.