thumb|upright=1.35|Double rainbow and supernumerary rainbows on the inside of the primary arc. The shadow of the photographer's head at the bottom of the photograph marks the centre of the rainbow cir
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x855fd63477ee1b83d89b3c436fdc57fef8101192841c36739d3437425f1f476d. 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/f21dcfed-7c88-44b8-8989-4cf918cae95d.json and https://artists.proofprofile.net/proofs/artist/f21dcfed-7c88-44b8-8989-4cf918cae95d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1199be044fc08c717952cf3c34fde5423abd1292e85e30e625fc5c22ec677af. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZK6G2477276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41459d3856cc6431dfba5e5022c251511a32160b05fe879c8abca7ca20c316e. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZK6G2477277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af18365a7f9378b7286749344b44548729b666fb660422b76511332d8928849. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZK6G2477278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b89936629daee992c8faf938f4cf48174f8c8ea50334350a8f4e2b3c0b90284. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFL2497598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61efb1a1c32bd821c8202c4b46a98905f397d3721c816bcd77670ee7a7bfe71. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZWFL2497599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef22c6dda9ef7c73f2c425e488432cbd76d828e9ca7874c12fb39b62b55f3bf. 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/QZZ772467727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x036d490028d7eebac3a57057f940eead43d1220ebaa8e6b97d9c4bce20b21afe. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZZ772467728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c43a2bdd8d84398fb786e0826e487ed9a5fd9dac53891a1f63849f9d87f4609. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZZ772467729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa55a2cef99ebc11097a69ff7c17b058e14ae384bb0375e84636e1d135fc1033. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ772467730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ac41e380b27912cb05141b8f1899bbd1ba3f29b6e194328ee38e74e7ca3596. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZZ772467732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6528de2109cbbc6ccd528bb42e6ecc5c0ae623938825f472dd26965a029c3f. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZZ772467734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60863a83b45668c3f1eb30439a209c66edf56f74346e75c17effef5969c5b801. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZK6M2592569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443a2ed8db7988618a0595b4b53d26ea491cf7fbde2b8744088f214441059db4. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:38:02Z), 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/QZK6M2592570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9aaf850c00477cbe60cdd8b93536a9cd32c0b87db93e19abc08c89dcd0c241f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:42:10Z), 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/QZK6M2592571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa94907053056fb8a08b6cf861f78fb0a1028c39f522011b3964ac502e21e043. 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/QZK6M2592572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04385f4b703525a4bdbcc274d4b514f3a35c460ba75839a6f1c70e65dc7b6bc4. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZK6M2592573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5bf6f47f8155866250ca6e12d06b628ccceeca9a0b6bcba42010614d5c9005. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T01:55:26Z), 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/QZK6M2592575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdfe775806b4e58c2c5233844109435d0484d3f787c3ab83f0a02448538908f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6M2592576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796f03120254777857c3ee9906c319aa57f2c8fa8cd68c0fe6875b2b588795a0. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZK6M2592577.