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 0x8dd5df8fa8b173ff26fb991f57e28ec926fcc3cc3cd45382f799c0e514eb47ed. 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/3bc756bd-036c-4f87-b1dc-fcb9c430f91e.json and https://artists.proofprofile.net/proofs/artist/3bc756bd-036c-4f87-b1dc-fcb9c430f91e.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 0x900f7688385603ff4b6f280c590a640236ba3a13663413e35d08bcb248f55677. 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/QZW9M2263560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4696b068895dd7f22c0dcb58d2d709ada7e68fcb3090d0e5535e909a27edfba. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/BCZFI2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7f859018ae2fd0a9d1a331d6f2cf9711677eff26e67266ef2326a895ac68f5. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/BCZF12300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee482a9e6e2879b3d1ebc24d4c4b3bfe4b93967c97831f3cab3d197ecb968b8c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/BCZFI2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90fea4b3c043e6bedf9fa9a67243880a0dab541a5640bdb073720904d245e4b. 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/BCZFI2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918b04008c373c2e4ebd8fd3d64d8faef3631ad4c70f023343c5d3d3117bb628. 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/BCZFI2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d4d5982fc3dca2a0a63d04038306d15b54defe3048a92624e50fe07c635856. 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/BCZFI2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b554b934f04e2418a97068e225cd9a729c88f1b93339cbe085651dda8ca729. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/BCZFI2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43ae015afe8f87c130da0335d8e94a7d84ee56d908c20db493c529c04f90807. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/BCZFI2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91b18a572413104e430fc3212bf9c8994fdba6fd828d21955fa1bd97f38bf77. 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/BCZFI2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387f19ade2f822cad2e93219139128891e420c698c4c3611a9b02de13806ad6d. 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/QZTV32477809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf214bf85cdc33e9b35e9e354ca51eebcfe997d692a72fc16fa3b15ba34356b8f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJV2502778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3f165bed9b3cf82c1d5d8e8293b64d7d2de98661fd7006e1c7e1566afe3436. 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/QZZ8A2503942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a4e45e6d5270c36dcfe65b850cc37f97b2a78ffa43dc7e9d7aa530a421cdff. 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/QZZEB2424506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9f45267679facc42d5ee5ca397da6a2234d9e2074a5b76505d3eceede11775. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/BX8C52300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9f45267679facc42d5ee5ca397da6a2234d9e2074a5b76505d3eceede11775. 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/BX8C52300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01f995ee865636148f8089b90e03b5aac5d95da2956216f09f3200113951f20. 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/US7VG2243593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35593e08dbe243f688a68f5107bdb1502ad059207afe1414b5da3012dcef8b2. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZNJW2116714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fe2839feac08f540439ae691c3b2cd9ad9223e3c1064417b2bb166eeade2ee. 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/BCZFI2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a4e45e6d5270c36dcfe65b850cc37f97b2a78ffa43dc7e9d7aa530a421cdff. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QZZEB2424506.