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 0x0b8a9fae9fb0b3d9de94966df0f9df01f854fe19e5124b05f45848818a99e630. 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/1f33cbcd-c31f-4c76-8c02-edf6bcf7ed74.json and https://artists.proofprofile.net/proofs/artist/1f33cbcd-c31f-4c76-8c02-edf6bcf7ed74.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 0xea9c5f506714632ecbe39d72c271946d4c51f90576bbe40f7946b8d26e541fea. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ISA110708301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcc45dd2a8be528db6abe8539767e2a4acd5972cd6dd0a54ca3161244d94884. 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/ISA110708305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1838e8a3993689eb1100dd43dc14b13ef9a201c84675d8c268327ad528bcb61. 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/ISA110701915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a17aa2a77c94cfc76c9a96492d2bdb0728740f03e595e9b52b2765814cb3bf. 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/ISV441416602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e5637abbd91887c369c44dcd5299e25a5265ba4230a0f875dbef909edb42e0. Chain 2 (Bitcoin): anchored in block 957699 (2026-07-12T11:51:06Z), 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/ISV441416603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4201e65cd286d6f6933f78c6b2408fde2c14c7040f30571dc629b715afbdbf27. 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/ISV441416604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52d19ecc657954cb6da8d61f137b72065e0723af1dd939f40d64add67e9e3d6. Chain 2 (Bitcoin): anchored in block 957699 (2026-07-12T11:51:06Z), 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/ISV441416605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b38412966f6d118c436c138b6eaaec6688e29684ed5afd03118fab57b5aa0f. 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/ISV441416606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f6d000ece322bf7999ca847b1eeee2a8438a0b6f08b965d778bd522c942ca7. 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/ISV441416607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f67b0d0e459d4828acbbc8972ea89b0b44a3e65ebe149137817583040c9669e. 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/ISV441416608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa386c3fd981fe030d703ebbf43fe2b842afef17e62d82773c5a5e75e02079401. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/ISV441416609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3ef389635c9c8e99e4005f643ef03ac68903087ce680366e11c02034ebd34b. 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/ISV441416611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6717b83a28656c936daecffc33f43f3f2b099558fcea2b8e08a9a201f820d1d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ISV441416612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83055a7b10720c751ff65f8a70f21c019444ce9556e766f44a95990a3212d79. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ISV441416613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a534805631c9c5a3e97a35c1ec81c62fe11393ab39a148276e416a518e9cee. 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/ISV441416617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d047251ad89d93487757dc35c66f6520cce35cf2a046a8fd07c842f51824162. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ISV441416619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0abc8662f21210d5da554136f4ac96cc4531a15e7cde6813c04dd7a5390eb7. 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/ISV441416620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808d8991f49fadffef826b6a7f9a0fa1bee7d09ce77d77206c7c0bc7af14c84f. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/ISV441416621.