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 0x10df4a63a677f01009cd742d000875fdb3099b2899330e57a6bb347fec74f67c. 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/c5e5da9c-9a6b-4f60-a154-ba1344c25eaf.json and https://artists.proofprofile.net/proofs/artist/c5e5da9c-9a6b-4f60-a154-ba1344c25eaf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x46e52b1816f4c769cbf8f3cef32e70ab88cc0a7075d612720aa6c0c7dd4ae57d. 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/QZK6Q2249607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b1a2ccab745ccdbb49eabe63d3daae5ad9a117349d1f3c50aa32486150e1ef. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6Q2275445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc986d4f016ddd6189a84c1368e7788a2f994f2e42e2fddce61dc77e7249f8d9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZK6M2223070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f37d3bbe5e9cdd6805d15a9d6b58ab1f5cf6f9c3139c9daabd7198968873b8. 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/QZK6L2205116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0a21de1ab57febe4f26d55545f3410c5bebf030695e27bec0840f427f0a0a9. 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/QZNWQ2269220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6c01a204e38c841cd77466809e5bcf732d4f85afd9f0f35586ac0bb1f76ceb. 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/QZNWQ2269217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a02e01a6868e69ef9d756747eb82b37faab3a7b93da12a4747e2736f4ce598. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882265697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6f096e5a51b07f5ef01f122ddd3982f658b42ad98a5358f9a3786322f40039. 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/QZN882297820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364e343714f38539fc50777a7298587bc10a46b70adeaf146f74db40d61b1211. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTAT2252764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23576ebe9b1e4506447b391468d45a028387e0d2d740b361a405c6c02f1fb483. 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/QZTAX2294967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753a663785aaee57953532bf620585bae75ffd38410260bf5c798c88f73cd2e4. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWDW2222750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfde8dda68f1baf0c927c09407c6256977a9a49370a2d3ae1036088e170f468d. 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/QZDA62385977.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c98955065f74f912d65668ceeb464c80de92342e04c7fd4b72a3a7f69da433. 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/QZDA82362474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fa55232f3af73291d030ffe4c3f66eb0dca5b92a698dea3254a2f7f3257dee. 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/QZYHM2365730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0552ba1b4f24b9e2e4c6cd02ec4c4be94be8ae1f01cce8204fae278f7b9b81c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/VNA2F2400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aaa081544cc6cc0382d88e5e17b50fdb3c62b5c00796432bc5eba7c1ffc76f3. 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/QT3EX2484682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a85138c3c64163a09309b68bb846feec38a880a860b34c98704fb6077528040. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/VNA2J2500045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80546c579a0993797342339bfa518b983d77b854a6a6691bcc5fc0403e7cb05e. 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/VNA0M1942169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892f9903836ddaeac2be31bcae84f04aa78dadca061088c0c602e8e01701f12d. 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/VNA0R2502878.