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 0x4f669308c232bfca63a0d17b3dfe965998c4d325a7a93064eeaa4fbea30e57ae. 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/74a68da4-f5a4-4466-a641-a4808e9a70ef.json and https://artists.proofprofile.net/proofs/artist/74a68da4-f5a4-4466-a641-a4808e9a70ef.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 0x2594975e51ba55e35925feec1dcafe69796cb41c29b337b18b149c7b66c7d1a7. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/BRMKP0600424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c13608124c02d397c2c70aee64fb07f0b0f547aaa57ab3e2aae59f677d9495b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/BRMKP0600428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306c9d92abe03a3fa9c1377b217cddbf388e85c1ce34afcadd69753fdd4a9d4d. 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/BRMKP0600429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc140ca8f5edbf7d3c1efff0d0caf1c2184096a20ac507ee47233e8a6737b8781. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BRMKP0600430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c436571ce5a0fbe3f0b893e5d2d2af1aa17ef87428baae084ba7a129a9fe68d. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BRMKP0600432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae55bbb42f35812246ee767b935cea85b13beb718a018e41a69632d01b53e284. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/BRMKP0600434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d04cf2e0eaddc755ac6fe094d314ceabf29d49d6b509cb3659831e72495e41. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/BRMKP0600431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49efa31b7a876501ea69f653fbbbb88d38ad0a1c9fa4329a14b9f9f5a8f82fb. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/BRMKP0300635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226044f60a082ded7d758f113d1b30ea4254ac863e73b758681382eb2bdd3c9a. 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/BRMKP0300636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa272e6e611b3b7ab51806c894f66ce74f64c13d1848fd2c6e9a12bf4e01bac14. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/BRMKP0300639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe46e7c8804f2a7c1348334078974561245bd610a5dac22758cae03129d5401. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/BRMKP0300642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd015c4314e07c5009aa18130051cdf80f4ee6986a2a025987b4750071bf0db8e. 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/BRMKP0300643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cb8985eb82ca46da730d6ed8e5dadf28340219ec6c3ef8c3a70f4dfe3bc26a. 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/BRMKP0300644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d13b7c9817e49d07f0bbe376644ae066f97b6bb8b548e721a7099e4917e3e5f. 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/BRMKP0300408.