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 0xa2b1c0db61ce18b56cb21a91dce1ffed398292499d5c9c89b26162a185693792. 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/a30e3383-bb34-4944-855c-cc519adf2583.json and https://artists.proofprofile.net/proofs/artist/a30e3383-bb34-4944-855c-cc519adf2583.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 0xb53aed202733060f89d555c4e159717b6fc27cec977c0168e54cc7b26c0e3712. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZMEM2270105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e338368e86e733df7c80b8cc943b23db9af1ef97038164ac35b0773f393922. 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/QZFZ22443991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3a20e7937a8725c46c7c625c2929516be166cb06e8ef095c3dd089e8d363ef. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFS2308665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5a3c41550e84f0ca20cce2ffd2d6ef52065c9d0ca3f08e47c42513eb21f6e7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZRP42210102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa583d84c458de32b0319a7d442d40eb3672988edf6a5c4b508d4fa901c614073. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFQ2333068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20c62bc9f686d0f94ad46c195859026d270c0d9a56b2c4f7a197d3380c0569d. 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/QZWFQ2333069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9d6dd70e204f436859660bdcad70b0e237ed865313557670e152d04d12670a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWT2264036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1723573f27e8083b1761a2fa56e8a4f218968ca9f53b5408446a57d152b524. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6K2278368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e24d8d8df8c2beb9b7def8498f31d31b4e379b7f6f3d48d35d3fdab762701b8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB62374282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0d6a3f7d160b8bbc588cb1b3de95afef158e99ce61e34c7461d4f7271b592f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6K2349242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde15fddeddb4f481964b5036d829b59e4e8d158bbeec272d4666ab5b9a97f46b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFYZ2488867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ca78494305828cde1431d40aa77cba2d91e6464487b9b0c64870c858c90408. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ62394732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e546fa5d98cc6cfe03ec235b5345d069de0667c1fad150fe9c37f121558f20. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWW2390912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f84c3b7a505de593d2dbfef360c3472298560d3f3ab1d30b0524a9ae523e7b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHN42368297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ea984adda4ee7cdd5ec66d0ce56128f979ab921ce7f28a9523e9b8d706af8a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAX2449592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc69366bcaeb510b20d8c429ee98d89f43e6ea534e45bfd9d4ef600c2dcc694e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTAX2408435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4f159be0c2ceab66dcd2e690d5cf2456eba259021752fda592ae1891a7ae95. 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/QZPLS2473826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab27cd52fd4a4457394c36f6a5e0d11d2ccf5c735d9cc3401e621b1a686bb73. 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/QZTBE2427446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4f159be0c2ceab66dcd2e690d5cf2456eba259021752fda592ae1891a7ae95. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZPLS2473826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f604c9adba2c286478e3199dacc968f725bb3312dc9a065673e76a709c9359. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTBE2427447.