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 0x59c838d08e1167d1d97d3932616d0dd28d7f0bc88e9631168b25d1a045aaf981. 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/7b60618a-6663-4c79-98db-e6eeafa0ec89.json and https://artists.proofprofile.net/proofs/artist/7b60618a-6663-4c79-98db-e6eeafa0ec89.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 0x9c138835f5da7fed21bf4edc2f66200f0919071261dce35fd26939661b9b2d35. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FRX202288769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b52b0443e494fbbd2cf25644e9261141f90beb9ceb811742f4050b27d6bfec. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX872476545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65af95159437cfc7d68c4e966126fbaeebbf4082bdae015e9ebfce14d4feeff7. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FRX762497632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77b146cb1798799d6c8dcc7f1dc5ebc34b3c38deac79f8b73d5e4e5569396cb. 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/HKG732423255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1eb1f09f6097aa91c9ee3907f0b23b3e3705706b9ad5919021c008e8cf5345. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DGA0M2478081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dcf371f740b45dc55423c5730c74cf86256d80ca51d617a3d1fa8dfd3161a0. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/CNZ632401164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da7557fcb138c35f8fda2e6197d0b9d6b65da4b1b6618d4c66b1e8c3f8301f6. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DGA072428791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146bb8093b2bc962f9209100bdb0fb862f8bfb2b937042992bbdb8fcfed8f22b. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DGA052454049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35e45e5a9ed6cdcb45180b9195811195c4c18e501dcee358e129585bd73b3e6. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/DGA052404997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfadac4d3779dfa6800e6d149619e8f14cf363d3ece61af65444e431c98068de. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DGA062410688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9c2ee75300e09bdd3d4ba2dc34ecd452c20b8a683f24f26eee3fdc1ce84ac8. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QM4TX2589841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecaa271cdfa62f32782b908e94968ed2fb3e580e52b55c91ca9cbd7a2690ad2e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QT3T42510621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b368d943b51c56a5eb92fab3af96a232004d597fc7eb62df8a46ccb2176b3c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DGA0T2401933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cb445419916683260c57d683cf32acd19de458d39384ce4a0fc088eb0f1ddb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DGA0R2483554.