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 0x0592430c3e85e71eaf24dc5df9bedaab908fcee3b75dd5ce163edced32df6ee0. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75b72fce-ffa5-4b67-842d-77600708765f.json and https://artists.proofprofile.net/proofs/artist/75b72fce-ffa5-4b67-842d-77600708765f.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 0xbf5ca0fb1ee5fbf1583433f666a12915c4067f5e88c625296310de95c7fdfa8f. 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/HUA611800725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dacadc072576086396a108c1dd039cfa927128437c56437c3a97244a5cc3ef. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/HUA611800727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4f2c1189a98cc54af34ed3d7e013461b811ffe2451477bb63285cd25055670. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/HUA611800732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42277f89858af4ffdbc92476bcbf790f3a5d364005283a6f0228babb9b7eec94. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/HUA611901261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2005fdc5c1023521b8672a2f31e72f13b0f6997f3d684db14d5cc3a1803a4a0e. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T23:00:52Z), 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/HUA611901265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f202cf14a452c5ab5e204e926b32f8a1eda38b33d6379af6fdfa648ffa7cb77. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/HUA612400980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab79bb664b4c74b95b5c8567e220b8b297e44e6d9b79f90ae3197200e66b6a1. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/HUA612400208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5fbce3dcb78eeec19cb211ed3f8212f90fd40568d3b0e04a99d9c16b2709db. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/HUA612400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0621305fe0fbcbead10b84fd08bebf9f98a5420b4f188d73f3491d783cdbaba. 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/HUA612400981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665c70480184e644bd9577828d642f8d553619f7176ebbe73b5823c9e4dd805d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HUA612400984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb032bb013137243a7d86b2de47b0947bf71d9e8acd82e911a408a15386498e84. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/HUA612501491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40962af45e7878317abb73b09a4362c118b0c692a8e99df1382576cb39c6be18. 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/QMDA72544092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23ea76cf5b862e9a5726225fe3b3f2d51979dcdede5c0af073bba867b785133. 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/HUB881707127.