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 0x0cffa80c6eb8b897ee4c61a317c05cf15aeb41bf65457915d2a0bc5ffef5a05d. 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/b72949ad-0f66-477a-9c25-b4b226d1d851.json and https://artists.proofprofile.net/proofs/artist/b72949ad-0f66-477a-9c25-b4b226d1d851.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 0xeb440857981483064e033169d199e3dcfdaa88f0c1658584953cfd17582ac4ae. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HUC091300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a639015eaef442457aaa15bb35a7e5af625535f13eb9b848335af0ce9e696ae. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HUC091300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1227f2acc35ede7c0d2d28038c28fc26b7d6532e37d36af53ed0d52e5c483b3f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HUC091300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d0f3da0ac39794371d19d906f222441893f3312c3a57c143b03858d9b14f9d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HUC091300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56da8135f504a8eee135635c11c720a29af2556570da42a993cfcf4ffe262614. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HUC091300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122f84d0b8a5f37ba2e69e590e1582a36d88dfeef68126e6c9c5ef3b91277317. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HUC091300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20542f3a177b4b11bedd0ada0cf22636ff52252631874065ac29d6f556a97ed5. 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/HUC091300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bf6894572c4c61b1f53332bce6ef027a6c5f615a17cd0a4b95a037eeae5582. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HUC091300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda839106d2cb2da8ad7da1f7a9595571809bb9c27b43195eb62c8ca0dc84e1ab. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/HUC091300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a14a260e596158851df9ba46f2946c50e8eb0c289d984fa172f6ff23c4ef39e. 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/HUC091300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9fdf9e83ca7801f324f7b8914c5092529bb1a53cf1f75a65596a2aeb03c72f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HUC091300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf106df9baf64375c01c152f26150daba90bfd329253aa0bb92ea466480f011c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HUC091300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9d287493cfc0bf321bbad49341165ee1a56637a9cd45dcbb43ada9b6b0c3d2. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HUC091300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec4d9499af6d74b587ce55d35c3291656f8af5a84f008742579d8fabfa532b0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HUC091300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b91281282524a0cf2c81fb39750489100f62fb513773e8e520815c5438f87c4. 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/HUA612000762.