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 0x1e4877c3cb713e065103071e1524dfcf74a882de80c442b637ce06eb84730bdd. 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/4756370d-6fe6-4cfa-a35c-4dff1e90ecfb.json and https://artists.proofprofile.net/proofs/artist/4756370d-6fe6-4cfa-a35c-4dff1e90ecfb.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 0x305eaae044f43595775c38157eb8edc829c60d44fa7bf9bd9ee1b74f5d12879b. 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/DEGQ11600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x743e6bdb0165004a862b9d18b2f479bd898ecfd035462a5f1d9deec3d0569557. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEGQ11600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fecb172c500d77c5b5bad2633f55ed29a63af1eafd63f8579a7468f8689a35. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/DEGQ11600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959a608a94ef7929aa6b3f4ee01c0fc7dfac95b50e552c1186e10d4a0e10d3a4. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/DEGQ11600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75bc4fc9c45db5d0a4569c22a3066b6d7e0b6acfc375fdc805ef9cd86b8c566. 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/DEGQ11600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0015571a80fc418a34534fc705f72964082978e15cfb6256e6de42d6817d3216. 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/DEGQ11600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f2c9cf8950192a68b3973a40e47f6044181470fe32bde0fa40c6d81e88d0a1. 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/DEGQ11600024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362f3fd88d6cedb38e9e1d5893fe4bfc603317f198ec3b2907f29863ad2c3e2f. 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/DEGQ11600026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1626b256dd4a73a682d8b0a0e969dd1af061548923a86867e246fcbdb0a0fb26. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/DEGQ11900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dd05cbab314a3861d184bce2b681db51f1a5f9178a6fe950b96a3379fb10b6. 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/DEGQ11900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222e7fdd16928f94f2ffe42641c143b121bbf51041b8757a70e67a1e157cf835. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEGQ11900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56df57a1c25cc3492a975c5dc2c8b47e95eda342b2b2e7e18f316e2e0da53bfb. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/DEGQ11900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe951c4489578cfb53e7a35ba514c21684bd5cf5196c5a052d550c87f2e5f94e3. 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/DEGQ11900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bf0ef9b77c30ff7c404429bea21ab6ed0c6b552c3b49c3b04a7caf0d1f968b. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/DEGQ11900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c783fb32ebd5fec8f82368844d6aaa84032a3b458846ed88e7e543b11c736c. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/DEGQ11900011.