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 0x49448c3dd26fd4e50cdf6df3bca1584e08467514dcbc0e9fb484a31bded71f9d. 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/245432b3-4b07-45f5-8946-7dde3f55d0d5.json and https://artists.proofprofile.net/proofs/artist/245432b3-4b07-45f5-8946-7dde3f55d0d5.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 0x30b39a60070e2e562927ab8a4f9344fe530dee8e4e55d4bb1b3bfb6106f314cf. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/NL1AP1929624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8b5b4b934e0697725cbce6ef025dcb7fe35fb74d68829185e41ec5e90c60ef. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/NL1AP1955282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d84fa7fc7a0dc0e45f333e5d97e65de25f1fee132f9f092e5e304f8d081911. 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/DKXY12000703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1ba8a55b1872c34cc4f438646037bcee10dbc754e0df2484c6befedaf9f4da. 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/NL4NL2175010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f34b8f8e05d0b05d2290d13ba57a58f85ee759ba4c2a430fd66addd7742410. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/NL4NL2175012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b018022abb9f36e2009b843cacfee8a94aa167e92d86ec4a6748be327f06d4. 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/NL4NL2218319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5594d37d61414efa9fcdbffc5d8756fc228e054ae5cb33221b1f9b9d2f266ad5. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NL4NL2220277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499873bb1de72b6d29bd9525fc4cdf047936fe3f9c429110fc25ca1433ce35e0. 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/NL4NL2220457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efebdf1a5f18dbef5195a851ade58444dc77088fc1260e98ba41858fc9af8a8. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/NL4NL2220616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e93c62f12daaa1c565f326a5e2f445f986084caa45a06d27d5aec13c0c30f9. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/NL4NL2220708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dd6a06b17d2b4c9660bc1fa66458dd7c02504721e26542fdaa1f161bdd4fa7. 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/NL4NL2220710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911f82802da99aabeb3f0dc9ccf7e9c2ffeb1740546c4a525f61d45dc8dee021. 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/NL4NL2220711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeada76bb93fa71d5b2a5b81b3c702683ed993f0a5380ca1b433c04154e1a7b7f. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/USA2P2258436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa709cf870e10fa971c703ae24c36f9ed91518ae73d43be69b344c3991021c3e7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USA2P2317350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc60160b024db6ee8fdf32ad571c92c7c884ead5808c082327eb082465e70d9. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/USA2P2349535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3f3eaf0590eafdd5bae3a50299327a8f4b8adde900cf13108b715c01d56a1c. 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/USA2P2351884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32094a549e6041ddf9ce6481384b34990f34c0ff7cb0f36e1af54d4b752345c9. 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/USA2P2351885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea802d772bb1bccd4bc23479623a97f2422e358f3da442dab17223966e00fe2b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USA2P2351886.