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 0xa19da45cac9047797435a4c36880c4664d2531348c6be34ca26c390c1bc36868. 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/9ba54156-a70e-4797-947b-8febe31c97c1.json and https://artists.proofprofile.net/proofs/artist/9ba54156-a70e-4797-947b-8febe31c97c1.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 0x07e771a85d8853abd10154276036dc7ee5499f2422ead7c9f8f276192cd83fe3. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:45:15Z), 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/AR8TN1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99a586af4c5756061e5eadffd4fe416172e3cff81cdf07c1596814b5cd022ab. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/AR8TN1800320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef601dbef1d332832b646d11746e50d3242444b26d3c30cbf4017918d15e999. 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/AR8TN1800324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f60c6c4baee2a975871b554afcc46a2cff0a9fe5fd77008973cfd260d9b0fca. 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/CA5KR1949953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d382f3c034d4bda8c728acac2f43063bd93fbbba7ff55168ed3d65610391295. 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/CA5KR1977597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22fd5d536bc56e5bdbf5a84eb0b08663668d4f0563150b9ef456a0578d45379. 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/QZGLS2073062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73399ad313eb9df8041bee7ef8f47fa1ad12ee5d623d9968f522822cdb559bc5. 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/CA5KR2114294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a45dbe3b0de60b2fcbafb11bfd2b2fd5f9c395e636204ab4345e01dc66020ee. 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/CA5KR2201274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff0f4480a72402bf6c3b75c692f68a31cc6efbed5b82dfeababe7ca220020f7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNJX2399748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe659ae72ad7467ba632709237c4dfa9f6a4e3e5089a689a24f2f4d1889e0a616. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZMZ92415920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa5cc7dc141b1deaff9a5aa238609a25c42b56558207b199e579b0310d4033a. Chain 2 (Bitcoin): anchored in block 958351 (2026-07-17T02:38:05Z), 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/QZMZ92415921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a98f8526d285c33fa4512bf0df2720a58078e481ba65a6756b6535db443dac. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMZ92415922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e13a26559922a312f62235856a3ad703313f6e248ef1178a207b93331632ec. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZW9K2430896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab979f7f7fc903b68c7237a8370a62395c98218991f5ff721149f270712b9ab9. 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/QZGLM2060149.