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 0x9f2c956bd827d34459b5dc29c715ce3c343debeb94f711d032af453b3f3cdc97. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1e01b25-f76a-4b4b-88fe-87fde595927c.json and https://artists.proofprofile.net/proofs/artist/c1e01b25-f76a-4b4b-88fe-87fde595927c.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 0x9e5ba45cb3e00333cd57869a158c997b271d82437e89df4b180ebb0ed37ff787. 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/QMRGM1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb687770851d8491f7af93c59cc252a4ea7cd713aa4ff3ffc254a448e3ea428fd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:44:27Z), 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/GBEUE1600039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175cd940ba2fdc4a2faae75b33999eee039fed77b6444261506994568100455f. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/GBEUE1600041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4138aa033a11f77bc5737bc839410c7766c8e2495936ba37bfcee9e3da207953. 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/GBEUE1600050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4138aa033a11f77bc5737bc839410c7766c8e2495936ba37bfcee9e3da207953. 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/GBEUE1600050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84c5b5ff0c51979603b19ef8e0d6b7fba6e8f37bd476e42c77fef49da64a4ae. 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/GBEUE1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84c5b5ff0c51979603b19ef8e0d6b7fba6e8f37bd476e42c77fef49da64a4ae. 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/GBEUE1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70ab396947b955de1b61fcdd53f7faa610b590dccea0f20f41088cc7ce7c79f. 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/GBEUE1900212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3f9afd129a11ff3f4e74eb047796b6d8c5e7c1273150520d266d125039283f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBEUE1900214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70ab396947b955de1b61fcdd53f7faa610b590dccea0f20f41088cc7ce7c79f. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/GBEUE1900212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3f9afd129a11ff3f4e74eb047796b6d8c5e7c1273150520d266d125039283f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBEUE1900214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd22d7d8327261205815ceff2a5d980bda7a4de1e39c7bd830f8b4c679ab9bb8. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/GBEUE2100204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd22d7d8327261205815ceff2a5d980bda7a4de1e39c7bd830f8b4c679ab9bb8. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBEUE2100204.