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 0x0da9ef46adf5420f93fc9fa1d1125ad77e16fa2e96a942ca6276f147ae905243. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25bbfe3f-1b0b-4fd6-bf0a-e569c62866ba.json and https://artists.proofprofile.net/proofs/artist/25bbfe3f-1b0b-4fd6-bf0a-e569c62866ba.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 0xa6aeb3f1554eb3c08300962ffc912086407a01319557e02fa1c9526ed2a0cd9e. 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/SE5NR2000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cff99591c2db55e4ec13db6d98c265aa9307568d0c6709ac39ed0dcc8eace80. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SE5NR2000108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef29d663f91e6cf45a7997d19e82cebe009595d59f05b32a66c6826cefd932d1. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/SE5NR2000112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c20cc425d5c783645b3ba20a7bd9fec35f184da1676d3113a156948817f0a5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE5NR2200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86b906f974d60a8874b49bf026414c41c69f9ea0e1babe3179f2353d36fa158. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/SE5NR2200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775ecb669f9e9a01be1a3ef9bd42cc267d4dfe9240f03c25fcfde1d0bf70dbad. 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/SE5NR2200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef791786a8e5a369e05191e30559da0c3a39fc1672f59a7818e9a78db2a6d357. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/SE5NR2200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33edfad80e0aae4bfec2f21cebc493a838a9a31636fcb080e507c9488cabc9a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/SE5NR1700205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2490e775eaf24ec7b467c454f92855f21bc50132a83cc8d6d3b580f4f80b8332. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZAPG1717006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00a3c5a51d1a7089f24c93a160ffabb6e46de70a61598ee13696794b4af3d23. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZAPG1717010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb988b9d555ab99b52057351558dd1edfa3a4cf5cce4ca57dc839a6081831a3. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZAPG1717011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d599a94816a72c78988c452ee2c388c21c9c0fb76c651f4fd349b6fe3de225. 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/SE5NR1800103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297eeeab0cb47bf5215664b5da124d295fd14779be7cd3dca28278f5360e0f49. 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/SE5NR1800105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb019e221f7a8b2630832a99f88e177b14382f67c387076c23507160e5ceebcfa. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SE5NR1800110.