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 0xc1d1a13bc2cad18a467c3b108f6ef4296d7c4f526475727f05944f2dc589658a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50107cc5-f637-41c6-9b01-4e0a54e57b94.json and https://artists.proofprofile.net/proofs/artist/50107cc5-f637-41c6-9b01-4e0a54e57b94.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 0x24641030c82bdbe2a3aebcfcb361e4932729481c2c6172d89f39a4ea6d4ef44c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FIFMF6100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c5beaf5bec0670def90d7a64f82bccb2347873770998b439770f0f68f64454. 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/FIFSC6103200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163d4539e61e2f5546ed0ff895f7bacc8d7ee3d741010b587f79cff420e79ec4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FIFMF5201700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa28536c29606488547bb58f16e0d83ba13374760a59f35fbd05bcb2b97b6386. 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/FIFPS4200500.
Suomalaiset harmonikanmestarit 1934-1975
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa323b43e04de69b435d217875d6e0c8c660838406e778f0268ed4c2a9c2e9c7f. 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/FITAT0700024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bc454f8975dd9087780a1fe9998e52fa130a1a58c77a2c0d01529dd886f43d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FITAT0700028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dca0f58cbc40ea267bc87efad8916bbb3b28c9f94be7c7290d75733d27f0dd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FITAT8500209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983fbebcb30e69341dc8d8d2734fb9d993b7fd14408394dd4f858f433b9c472f. 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/FITAT8500213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe7d419c621b56288fcfb11d94a7c8cdb7d0b8674f0e62be8ca7164b071cd0b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FIWMA0300721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5c12d34e16eae73c62fdee24d0d69843fde1c5a79c78e8264c13ae6d7a393e. 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/FIVLM8400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bc9939fc15b7250349c5b735d72a6af8a3ab03618a4c3d5b9ee15dd9c8c0b8. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/FIVLM8500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d98d600f834b90e8b541305ea44b702ba5237d83875157391fe09bbab357a72. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FIVLM8400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f032eae533c7f62c53c9856744f00ebd9b130a305d04e0e98d02e59ef77caa. 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/FIVLM8400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa75ab866696721a002fae1eb2eb3ede9586e2421264b34bb4c19f6a7340b52. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FIVLM8400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf539def65708dc9233ac6f3a5c4a885dd2dfaff10681305d79ffc059aab3328c. 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/FIVLM8700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8ff09cdd690b5146519c6106b39e6dcc601ff21a266ff9eb322a5d7bf62cd8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FITAT9700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebe32faa0d3cceaeb02b3526b72575df190b49222a69435b7ac294022c9c0bc. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FITAT9600060.