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 0xb4f28fd50f585938c99e0d514a4e977e7d074552edd59eb409c900ddac24e669. 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/7168965a-dbca-482b-be2e-3a62a7e96c7c.json and https://artists.proofprofile.net/proofs/artist/7168965a-dbca-482b-be2e-3a62a7e96c7c.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 0xc155d6469b9cf68129527341b02979a10b490adeff1e05aeb8eec7b036ee9170. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ52031381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55ea7e95a7cfbd5fc410d29464aa824d483301051b413c7b3f573d29debabb8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBKQU2087095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e3c179736e28fa1daf8b4e850bd629e79b55a47237fff4c7105378d6223e4c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBKQU2087096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7561a18f4b5e30cc10e1450590d5c4dc16828c5681154b08434c27038243e6d4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CA5KR0002532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3ebad769a991b5609d0e7b71bf51118f5ae5468a8fd69844ce80646b0589fc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR9Z62100450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37f4a87b990b883fb8e606433ee03d52ccb28555e033034ecf4a53dfadce1df. 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/GBLV62135084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f14685d58e838d86c4aaf4444fd3b6deee9795ade4c065aecc4997334d52686. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/CA5KR2344341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943110e2bd74e41cb0e8089a515d974999763f1772ffc946f2f932d9210b8ab8. 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/GBKQU2381326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37daea58bf32ba6065a825af9c58fa15c70738a477c9baf9bab3a77a53662f44. 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/CA5KR2321738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccb3d5578d48ae13748de28b81636c9b54903173be6d8072573f2141ab8a01b. 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/CA5KR2369396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e1728a6d96e3b2f06552c0b9b7e6e40faf82289fadbd1ff18641484f4420ba. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/CA5KR2356195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ffafff3d6e320fb07fcdc71ecfd0ee38e50f78cd3209fa9315720bbd9b189d. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/CA5KR2433669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df00cef9fa4f69dd41a86eb1c62bf7e37355f71504cb5fb092b3b690aa5abc5. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CA5KR2334145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f14685d58e838d86c4aaf4444fd3b6deee9795ade4c065aecc4997334d52686. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CA5KR2344341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cc1805d96509f03b5ccd24eca3be37f3dc44222d1836b51f500763e4736b39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMVU41900011.