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 0xdf5b2947627562f5a2a9b8665751fe481fddcc2e349e96cc950b77a5d74cba95. 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/219e4b9d-7da5-4e0f-8e26-2428ec2e01e7.json and https://artists.proofprofile.net/proofs/artist/219e4b9d-7da5-4e0f-8e26-2428ec2e01e7.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 0x771017951179c74a43d62295a1c85348b53d02cf4690ded3bb463a75855527b3. 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/QM24S1822746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30cdf8a618b037413ec6aa073402f23a8e7c89b0a34428d449efdb7799bcded0. 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/UKRBV1800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc776f7d28a6a4df240165856bfc1179c46def8824c645759cfe6d76589885fa9. 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/NLF711907225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a13174bb1bc1dc65f2834be3d1092e2162819088cfe2c87aaaa5314804f581. 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/NLF712004305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a5e75d07ddeb04e1bedccd2c2b8d144d1808dfc28be9f3df17cffd26590b5c. 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/NLF712102872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf284d2e9d43b318c00d66758913abea1f03209aefee8e5f010594ccfeff91ca8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ZZOPM2105992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176371ace454af6372763b2d1fe2d3f53656617ecfe5a7902d48ece2eca72d70. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ZZOPM2108936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73dd62d7f2ce37e4d64190a8ad583742818836c787913714282203f7231c0cd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ZZOPM2115678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7459a51ff641061a23cac12c289fcc5ca1cb91f1f0debbe5d95a7e2250fc57a4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZZOPM2119306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3bb2f935285d7eb9111728bf2a70e8fa502c57f481467b770dd8300bb341ce. 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/ZZOPM2236060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993ef1e46561a0e23a02f342d30657692385f3a2581f3a39b121ede4298587a2. 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/ZZOPM2237984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1df99cc478253937fda05ca971ce27b6d78320448698a051b6d1971d19065ab. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US39N2301260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300486558c92c0abd0c1bfed4bc6ba800f467c9c62a9d6e10e5da2ee3b123172. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/US39N2306384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a2df8afb9c1037b5e3e8390cab8b6dedd8d8781cfafc15d4dff92e311a9711. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/US38Y2408459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91be2d3a010b4d09c3ea91a56da6b220dda3e8e28ccf9bc6ee16fb2fdf9dd434. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZWFV2435931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0b3dca2fdd62d0fcb6ff79e7b144c9febd894ea0c8c6b121ec9289db101e8f. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/GBGLW2500806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69f01842a150c1d5969d970803d8352ed17ddd12484c141605fc80d315b269b. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ZZOPM2002913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4b34f743468f1c095de54225dcfe7d3d7ccfb8a91838c3b3961552e81d3e5b. 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/NLF711709301.