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 0xa545378f5141bc42c21b1c3c737f3759ac8d845d10a276af0903d0522c56f6c9. 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/bec4a5ed-5f57-4fb3-9de6-768fef4ad6d8.json and https://artists.proofprofile.net/proofs/artist/bec4a5ed-5f57-4fb3-9de6-768fef4ad6d8.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 0x66f2064f7a37003d7a693bcd8b43603c957b541737bfe23e841e88fae4704249. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DEXN92348127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7803227766856ec9ee1e60d912f5c5c982a2c5c9d2c9179038e7f791425dd8c0. 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/DEUE12495315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d9068dfbbe7e50aca101e1472f18a5bc8b7763d93bdc7b2c4286d00e6b1846. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEUE22453226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49143ddb9e20d9b5d480236c26651fbd01a0821e9588f9618546a59206db722f. 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/DEXO12470643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971378fc4d179d2e6682c684092822f08a1db1a40f9bccbe007eae11990a89de. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/DEXO22465555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b24fcfc3cf1b67897fb713885567c12d49f01768fd86fe4719432822c388db. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DEXO42481953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bbf27f2de819a57aea00bd18531827105231710b5e96167db19a605010944a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEXO52424094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f81a0a4caa309f3e2304e6329eecfead268fa094ead5117e386a83b9f25c48. 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/DEXO52436703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29093b1b784f1d9e255535ce58785cde64f68092ef91d938bb65b7d00c48c6f. 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/DEUE22525224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9556befb581abec407ad17ad03bb680f7a164e2219861cfb92cb74cf59d69d63. 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/DEUE12592550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398d3829ccad03ac1c05f836953683f5b971851e9d65cb812476a4cda7c31871. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEUE22557898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8649a4b64885c35bca860e0c20ffbf1ef2f8d3718d4f4180cda715e883d0f0. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/DEUD92581103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94af72ac645db8463f0883238499e25593289a28aa5ce23d9f17d5dce14d889. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEUD92541185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f8b1cae755b400b507e6aeb24edf5a2aee3fdbd9bbc63f5cbc6ce594c3a2ca. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEXN82520624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27070be7e62bc940c8d7b902e839925fd955f5663a609fa8c2b3d68012a782a7. 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/DEZC62357628.