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 0x23f233fa3d51ba3a2e26799bcd86af0b91ebcb1a025f430a084417fb7c858bad. 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/a8381a68-e1b3-45d7-9bcf-66b86106b713.json and https://artists.proofprofile.net/proofs/artist/a8381a68-e1b3-45d7-9bcf-66b86106b713.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 0x873aa0f90988255d1a8b63fcfe48976777a1b7cb610ae52f7f3204e9a8bdb6f9. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZHNC2160377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaa6388aa04507901cc250d11cbe8bad002a335d1682b9ec5189dc6627b424e. 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/QZFZ42235325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf859cd2c028cc4297825510ccb987748fbd431f6f97123f6af6997ed757cde3b. 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/QZDA52265206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314264894b4cd25a3bb92eb7e732f30b7060da38db29347faa8633c5f30eae7a. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZDA52282970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe759467fecd28a1f36b498713ae4ad6b28cbe52173e95c75d649805d717b5d67. 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/QZFYX2210799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f1f3f82f1c61ad3c5d049d2b5c123fd274ed7f42734ad23272b45f0253297c. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/NLRD51632934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b47147f77427c14882e32b5dfb622bfc133674447838a0229cb2bb8e8fc098. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZDA82318591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967e7ca75baeb1ed27efec12cebd666dc383987e79ba8e44f9351ac74f771fe9. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZMEQ2224558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431f12a1bf3486324ffd0f22e380c33043693ca7f81035565755d53027cea776. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZK6P2356779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91591f34dec0736971ee35d75c3f355b60cd3cd1784d1418470bf5856dbc7f85. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEM2395668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c54b66aacd1f05d634adbdfa1f23b3ede9053bcdcac7683ea834a8dbd9dc27. 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/QZNJZ2430444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e5358493e9cfb50de47de84386c7b31413ef2be74d5f25f49830f04bfca8c5. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZW9L2484779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe19ef2688a0e278566e06268ddc348b004e5c24d9161d095c0a3f36f67e3a2f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZNWX2399591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91591f34dec0736971ee35d75c3f355b60cd3cd1784d1418470bf5856dbc7f85. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZMEM2395668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb81c370c1611f8547cfbeaaf668a2009dbf4988c9aaa7c1ff7956d289eafbe5. 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/US7VG2547519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa468c136ebbdad74894231733c79173b7a720d8ad61c6870588605ef01526278. 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/US7VG2547520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce2e6fdf39b1a9eacd72aa9ad8d2abc1163bcfc2516e6f169276ce81c78b3cf. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US7VG2547521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1125744fe13b3bc4ce92f2d8ba3b1519653b9e297c085139aee88663ba43f98c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTVM2453789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e5358493e9cfb50de47de84386c7b31413ef2be74d5f25f49830f04bfca8c5. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZW9L2484779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d42f47b4f7af610eb70974dc0309dcfeaec15375f496ca0cb221cda86bc16a1. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHZD2069526.