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 0x7f2d53d1500375f6f27881bf035028b9c092898d7d2a948580add8c3f86f53ed. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ced5d688-f17b-4e5c-ae90-475e4a8862e9.json and https://artists.proofprofile.net/proofs/artist/ced5d688-f17b-4e5c-ae90-475e4a8862e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x9d05ec8e01574cf9874f30ab52f5f3db8b5ef13455500646b837f55ec71ecc2b. 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/GBLLT1511937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65064fc9cbb4cbb2b0179f6704a5581f6b9203b9b208022e50bca13f58262458. 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/GBLLT1511934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d02cc839944ae8aa2d6539dda33924ea500c2923c1f2cf1383b8c913ad9327a. 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/GBLLT1511935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c90181e604d06c398edd0fcb801deb8eac6e69553390b4495eaeddb3717bedc. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/GBLLT1511936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9096a6171486a50f2420028e8e2771c47ed74ec2d149756f2f03a77904bbb71f. 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/GBLLT1511940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0da3bed2012efed12790f870d37e7a1f4cc9d463f5db17d79789acfae666a1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBLLT1511942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7fe01ae1642189943d0b2b336d176a38fac4b1be52395386f94f6ada6f82b7. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/GBLLT1511944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7717cae0a06f04579784f970a47ea58c18ff919b275a87649646649cfe777359. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GBLLT1511945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d8505d69d6a1f747b4831eb70d1b767789273b073ea7db66c1bc063bf0df42. 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/GBLLT1511947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e764f98e2cb4ee776bb32233482e59944f6eb8d79a2276127fa50c39662d515. 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/GBLLT1511948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1261df378618d65d30ab14dff21c91f7be947a1f1073b405cdc71c10c559499c. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/GBLLT1511949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d79dbaf603538fd6041e40edf21e86ebdd16f1fbb1cf72e7dbb1d63a21a8e38. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GBLLT1511950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdef78769ae293bf737ad1101246dc0f2de95a68e92cc7fe5bd32d3ad458781. 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/GBLLT1511951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b762368abe08ee660508de29017adb52dc89215a499247f47fb3e4a17ea122. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GBLLT1511952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d02db26d98c2a8aa685b55e74fc3997f6cdb4bccdc812c77e09b005393f190b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBLLT1511953.
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