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 0xc8f40a3af71f47573844109dcb3e031139b4ccc7ae7a8dcda129d374b92ea606. 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/1ad2b451-2c8b-4bac-989a-9d98e8aa904d.json and https://artists.proofprofile.net/proofs/artist/1ad2b451-2c8b-4bac-989a-9d98e8aa904d.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 0x868b6cde83f8cbed3a56ccc79fbc8920a68df5d747ccaac596135c1469ee4e9d. Chain 2 (Bitcoin): anchored in block 957541 (2026-07-11T08:23:18Z), 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/IL5840009985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722f7cea42a42cfcd6fcd68f6dffb293b9afd9f2995f851d5d1ce542c0150ccc. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/IL5840009987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79df392ca9caeef4af7d54578e4ba57e6a20ade6f0488e044ca104411b73d42e. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/IL5840009989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d4a9f383624ad8717a8e60e4848e5b94de142dcc2623574ce1b23a3c7e9010. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/IL5840009990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9771d82ade602429cc282f56899382624b8ff9fb04063aba40eab7345e31dfd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IL5840806018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1a5218b1aef6f13a5e21b60df57397ad0a8a9ba17a6c384e848a97c0f2f0ee. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/IL5840805762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ba32e58f8c839c880be6610d4c2e062e45188c8c0972a4f306722075bfc692. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/IL5841201052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84d2475816f24bc83f6a0d67e59d46d13f082a2cfa8ab7fdb46467825888f2e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/IL5840306025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5768293607f48a4a54c20d6802bec3f48470a0aaaed624862e84701aca0e1b. 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/IL5840601008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98f58178a062764ec5ab361283b99b200e8e92efde18794562ad589a21ead3e. 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/IL5840601001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e44c1d4117dc7b51f2dbcde0ace88861c526e1fad70aede6d87507a39c28c08. 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/IL5840701015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc11d056f063b0f59a1f34272645c71d3051264b5abf6e9eb3c97abd405d474. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/IL5840811526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef70c9dda818ebddf566eba09cf581f11024c4de95416f1a0c126bfed284f91. 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/IL5840801025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfbba81e8dab1377c498f5ec6a3e58b3e5cb15193923e39c64c53084c42823f. 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/IL5840801034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98f58178a062764ec5ab361283b99b200e8e92efde18794562ad589a21ead3e. 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/IL5840601001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa553242d586cb2d2e80863b5551471587d87c534f111d27ca14dda04f16b35f4. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/IL5840801023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901c99ef1be897bb9a1f0c473208addd1f90c3e822500b110bb169978eda30a4. 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/IL5841301042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb89ba41f9be4f41b52722287b979bb209edb3709b3831e38fca5a7c51066d2. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/IL5842446492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84def501950be0c7bf744fbcc75a9f6b5c5d597d6d4f80c9ac3b4c34082b4ef6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/IL4432100200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dc97af5682eed66a29f2645df21c879563a73446da6e44b7744030098977e2. 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/IL5841409695.