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 0x4af43601437541fe6c2687655719964fcc600de778e5e8905711be9857cf232f. 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/82efebe7-476d-4a55-bbdc-250d94636ec2.json and https://artists.proofprofile.net/proofs/artist/82efebe7-476d-4a55-bbdc-250d94636ec2.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 0xd9ccff5ee55f45a70e1682a4f5aba731b0e9a23b04a56e7e58968b5185da9ed6. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZK6H2577976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1d4959db602337935d7a6b3a9708903f4632071d43cac4e11d798c46c74194. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZK6H2577979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb635675bd3ede2d22fbbe0e52e9842a0f08b80aa4840426a26ab97ff404f821. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZK6H2577980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5fd8e1bf1d90a85c9f9c7c0a688cc4d3ba5c70044f06c893e725bc67a72909. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6H2577981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4efd88c5e9da4caf111e559fadb8571d948acdfc51e55ec2fdeb40ff00d1542. 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/QZK6H2577982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4651f2ec237ef9d368250d778688cb64961d32ad31f1b0a03964dcd55ada0048. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6H2577983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1988cf8ec55a371ade361673b26b85bb87f188d0bbfbb2bd45cc5de23ec14a. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6H2577984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c422ae96ac7360712447df2f8f2784f978e6b87acc09151aacab7442647e3ca. 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/QZK6H2579829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc484cd56ee0d18eb9392613bb6377d36304320ee32213a43d6e77ce943be33. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZK6H2579831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfe3d6dd74e2fe166804c2b0922f52cb48d342cb4d87b6ec8fc0a7252cba20a. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZK6H2579832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf15e82d8d22c2d2a394a916019c34dbdaab6662d590895d2b65f9ac7adff972. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6H2579833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728e11f425f2b46d330d56aece8dc6f07518ed9ff6c4379ba5f7edc67eb84e08. 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/QZK6H2579834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d2f016d64866f5ed3283370fd1b2e93f3e89cb787399db0dd3cbd80c6563a4. 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/QZK6H2579835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a273c2131609d41d4177f08fa871ee27ea5585b8d6688fd2d6be2e4218a90a. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZK6H2579836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d83e65747799db19f27be7debd389db50f1ec045e4dc90eea6d8528ff54688. 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/QZK6H2579837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e9c2e8cfafaac00a614cfb2a09b6a920c16daffa22c2fa04bdeb9cb4a9aca7. 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/QZK6H2579838.