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 0xe3500631e4f1b66f9409e9a8b54c54e103b6cadf9514e554af5dca32f85b03e6. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c949a9b4-7dd2-4df3-afb5-af0827a25c40.json and https://artists.proofprofile.net/proofs/artist/c949a9b4-7dd2-4df3-afb5-af0827a25c40.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 0xdd8518e9c9ac344a78950c800d89fe2937c5abb02fc4a609d84c50bbe5d86d4f. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ES5590900453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb054357533090ef9fa69e0a7f288bfc8a19874f5ccbdff5393d05f5135b4a29b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES5590603427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2c1d822539cae6dfa42cfad14dbdd7d79292127b162560231795be8a524980. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ES5590600988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cfef7860ca9d7f345974a9ac8a293010ec420326535c4974fa4c22ba88bdde. 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/ES5590600677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5caa91d22fba2ec45af4308bb4c5ba83f146e0d321c4cae0830e4a33736941e. 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/ES5590603405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbac97a26458994853250a4393c4caf404bdd3a51de7e473703727e4debec8e4. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ES5590900454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae9a90552c396654fa675cf5535bba35a8e643fa95aa1c93e1f576b1817d02d. 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/ES5590900430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc789e2dfb0c407727c7ac2636d0e2dd0cb6a579175ec4bbfb89f1091e1bbf250. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ES5590601012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0e3a40614381151bd8ed3b556ddfb8195378e61f2a49fd2a5a6b1e1ec79e15. 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/ES5590900443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128685bae4a3a808ef88f5c3d85c6205d964e49626e949c8fe2ff6d54770402c. 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/ES5590602856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461c69192ea67a4517a62491f0d57731ef49e8a724de87b36709a35259913700. 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/ES5590700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74f220750e6e37e9c2febbf46b815c6611d982299f1788535f892a73613d7de. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ES5590600984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c4a92811ce0a3c5b0a338cf7f408fd948d1a9fd49768eb6fd86c5412103b6c. 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/ES5590700197.
Eüskaldunak A Capella (Les Plus Belles Voix du Pays Basque)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009ac246caf89603fcc149dedb01341206b3edb866025847f4a66c3804971213. 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/ES5590400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb65a41eade8d215f8b1432f9e798b2d55a85f0fd5a72a42fee1e63ea442b6d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ES5590400357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145a12042664a53298de05618c4b5d13f9a833afabf465b8d24c147f87212e03. 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/ES5590400361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c330119e1e0d938a380a30de84f8e07901ce1ca2f1615376b344be1bb4fbcf. 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/ES5590400368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206287cd1aef64a3bd16bf4562c37792635d9d50941b28caf1cef69e45415369. 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/ES5590400370.