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 0x3787e65aa1d7ee5f23611d3aea8bb4be80c9bc707f85af9c1e84fef20486ad1f. 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/25063a18-a6a9-4586-a9fb-3fdad05f3372.json and https://artists.proofprofile.net/proofs/artist/25063a18-a6a9-4586-a9fb-3fdad05f3372.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 0xf422af0b77952e47a5789ab188a18becea0cca6767a19a9ea15be66511432a60. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QM6MZ1897254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb989ef03af14ba087df724e342d57eb7e4066064d726d95eaea96a54fef19f3b. 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/QM6N21920600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc7e846fbe9832910fbf985f508c8c952f2d61d378032c955269449831709cf. 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/QM6N21920602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654690cc47fb5a49b043abe4de4568cf39f64379591aa7942210a579788a040f. 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/QM6N21920603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527414f9a9518ec0959a06dae41c727df2c230519190ba695735a5c77ee75b92. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QM6N21920605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6287000a0fcfd23c0673277a132171dc2e097101be732f6da8b8fb34ad9d7966. 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/QM6N21920608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a0818974c720206dc2e3bc43bf9e2079c24b1c8ba92b82a791f660d37abf3b. 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/QM6N21920609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58b970edd287789b68ba0a0233b4a45d801bf753fc43ec815745c3fe609bae6. 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/QM6N21920610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb6be5105b0a97d759a749f0ff18a4df06e6c906e8195e21af15bfea8042dd8. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZ7361804225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc7196b5ac42f7887ddce43475a53539484278d99f7aaee41d5bcf3632f779e. 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/QMDA62121646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf811f108f5d5f1a576a791a13173f503e42251fa3674ff019c9d0eae42a35a43. 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/QMDA62121369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b079edf4d2110a5f67a631f267dbb16b0592ada45df282a3a146bb180aa5db7. 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/QMDA62172224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f171c07d51f8a65320ac52c49c9803302a615a6a4cc3b067ef3d79f531dc51. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QMDA62121654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd586151cf699a8734b91ae84d59051e2a67fc6744d67f851bb62db44f36c9f99. 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/QMDA62121383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7fed88eca9a9f552b08a49ea8591db271ad5b1d622c8f10df675b95b1c166a. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZ7R41850357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e2602671c55a44f837d4516ff5e2a91e4abe7023eb51f5334fbaf2b055680c. 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/QM3UY1900006.
Los Éxitos de Lenin Pulgar y Amor y Gaita
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801ac3cddc626001a8af0f5d4e0217a585c89f0e0409d718d07dc71b70317dff. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USHM81831834.