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 0x660f6e41445495e2ba8db8b8b1b48236c986614b56ca1ea70c91bd6ae6fcfc8e. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cfa8f4e6-2c33-40cc-8922-0611ef169415.json and https://artists.proofprofile.net/proofs/artist/cfa8f4e6-2c33-40cc-8922-0611ef169415.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 0x8fe55f64de9dd185d2c59eff1d24ad16598afa739df063619b59b4e14e09aeea. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6J2148995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048a14eba2734ade56aa15716084eac48f662316b1b6d4f1206aec2ab79fadaa. 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/QZMEM2320249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967632141d0af5bae77bdbdb0ce7f31c3bdee4512cf0cfcaea990205f2e2d117. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMEM2320251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bb306866af910cf5f5c50284457dc9092df525ac3a2006cd7945c8e790860c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZMEM2320256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495d411477c8462a005773720be248d5f58a23f17ecb1761516cbedb2c50ec0b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZMEN2437350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a8ba9a95916d265d24752d275598fdc4a639b09daf63b802d3d3973486db88. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZRP52443872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccf2e2e242f74bb247f9affa5966ddf034c651e4b848b9d28c87c761513449d. 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/QZZ7L2487363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b433c62e46299748752e8a727ec58890fc1642bb46278c0b54687c81438f86c. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZHN72598937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb429092689a19e36bf89cc1290151ca2eea4a6cd80d63575ad27e5d421076a2b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHN72598938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31662e1dc1d81c3b4a3c991c9a36060618da3c9e4e34ad35a0a491a8d5185cab. 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/QZHN72598939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed09f73659a4c43ea390036b81ab56406002cd24ff57aa4d8500eddb566206d5. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZHN72598940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c48d73ccb8665975ed112dca0d0125831d8d8beceb45d30dbd140c8580d141. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZHN72598944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b4f99e24e4365df847cb0fd52a29c631231ff8454ad0d15444feee0e40a6d1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHN72598945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4166b703169bbe4eb6f50ef005e916c9124ca26ac740af0d9925b7e2ea4a6ce6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN72598946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e2de37622d32af24c3610654b948bd43889517793472b983746c45d30208c1. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZHN72598948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bbffa3379d634730ee5ab5dc3bc672731727e56de4b1823bc8a7f31e4a8912. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZZ7T2551124.