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 0x8e7ee5ad2c9e1175e4638c832a0dd7f6a29c122a74b5c3334fe6e36d09f9b96c. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/535b4c70-4b70-43c5-a729-e5923d442d20.json and https://artists.proofprofile.net/proofs/artist/535b4c70-4b70-43c5-a729-e5923d442d20.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 0x49f41ca5e6ec7acfee51c161f4337e336531d5e160abe32fc13c1f46af92c4db. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEE282379001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ba2cfd29122e5b13166c2dec66c6c3e80b19aae5f054a4fee7b038913db6af. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEE282379002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf87a0df9c157a666f14f5db7634802a7a80ffc4dc3a4870ea52dc9b44e60c3e. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEE282379003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8c30997baccb6d6d978e62c73287d5810be32b1b3cd5200f0305d2aafedf1a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEE282379004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feda64b5197b1a3352483408de04e8a9c661182667caeb7e6354111a20a0e2a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEE282379005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa62b30cfb65f2e61c860e7479bebd72ef2a44aaf67a7d1155069b576ea7158. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEE282379006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f825b84c9a573931522c7bd94ffeee6023821e41fdefad85f2ccff206c2bbd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEE282379007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41caa333222a23c3ec8bc33adaebc6d4d0d6d3b8bfd747df162080a0e52765db. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEE282379008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfa5c1c85384b554b81b192735ec52b23d7b8aef1c8d0fe0e60d6c291836fff. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEE282379009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468be599e66a250ef98e3bbe39e5567d0348ed00f04856c48c75edb17ca37a49. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DETA12100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55ce63a999c963b9f22f34016c981fd52875f324c82d1a62546e7f8cfca7807. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DETA12100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd857d27e391d25e3720e1cc9cdc5d5c2825be8aa60a679caa50ef75172046ff2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DETA12100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f757bffa87ff6837f9f1f7a575f0d52e18ba4c0f23b98e6d7173d122c1d53f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DETA12100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29984cf5454884e4598e95f756396f48943480ca5932b6333f826434dbe2895e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DETA12100009.