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 0x302d27e5e1c6162ee6c5527051bf8ecd27207de71eb6b7c6bdf66760548790bb. 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/4dafa057-c844-4329-bd91-c23171d88a16.json and https://artists.proofprofile.net/proofs/artist/4dafa057-c844-4329-bd91-c23171d88a16.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 0xb9316f1fb4ab08dc7387d377e3c8590b4fd2a0641ad8fa67712218fb2a4c6407. 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/USHM90624239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165432501735b7ce41529580e473a9821026b1d4a82ef7d95954aa800637b1d7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USHM90624240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99d66cee61960ed117aea597bae5380d1e5918624648189c74b28e2436a38b0. 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/USHM90624242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4caa5d111f566c0de7dd8c948fa81c05ac9106532b698895de89e5413831d77. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/USHM90624243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17276ed4418fc5f34e7636d4362a7668422e48e08a9609ed13c7c8fd2d81ad01. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USHM90624245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb697775a1893362da97f586fb380f4a6eb48068ffb5ea58c0bed2efd14e432e2. 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/QM9Q90800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b73ff09c57aacee8662442882415f980623de92b57bb6997c91e51f55863037. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QM9Q90800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa19a40bbb1ee4f84e6bb81e7098f8fce8b53d0e4483cb0787564cd4b33640b. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QM9Q90800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d939b4ea46177edc975154a7540ca35fc03d1a12f30b33c4f87d4a6f533ebd. 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/USA2P1140881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713901d560c35423f9be6ec956ed2d9be48369dff2aaa1730699bb8192e53522. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USA2P1140882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ec6e7125ae35d3f1408dabc2f2fadb4a8adbbdd2500d155f98701b0f751e7b. 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/USA2P1140883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae96ceaedaa7f20dff99cdd96aa7467b2851327e2fab7d8be548e74e2d897768. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USA2P1140884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc837cc553d058f650df465b2c17198adfa7e372e29db1d80f7a616fea2db58bc. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USA2P1140887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242ecea60a49aaeb3a4485d86c3e388f4005ec7b9cab296152e91ad449767fb7. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USA2P1140892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b4047d4ce168d9e9ebdc7edb34c76f298329f3793763f3da56b911385465e0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM9Q91400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55910751512cc26a05e1b540be22d8f65fbec0a93794b4c2af03558ec4ec7a5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM9Q91400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff35e773237fa61133852ab3d8d299933770a81dac2f70610bae4095114f890. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QM9Q91400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb93352c1d9ae97c876fcfcac841b2ec5e75aee9cd817f124982a56a53a6444. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USL4R2115045.