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 0x6e7a89b3453afc11ccb5d3b79396c1298c3ef30e10918914c560f6b0b08c597a. 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/2de0724b-a045-40fe-a11a-8f5a28f3434b.json and https://artists.proofprofile.net/proofs/artist/2de0724b-a045-40fe-a11a-8f5a28f3434b.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 0x50a55367ed9570875bda5871aaea9c969d2b1a40818ef0aa35240fb4ae4552e8. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ESA011718988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c4ee9ee083c07b1c7ffd48fb6ec95abba22ffa0f3e8fd811a4f89c615b34f9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ESA011718989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591dd592204b08b51ef0518a6afc48ec61cbf4ca6391fe5554f484931c67a688. 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/ESA011718990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4044cfac7cbf42a0e027ab2715ae12db18fa3ee4f2a0003ca30362d1f394925e. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/ESA011718991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc369d0b34a699288019e4ac25d78f530995b1296bed301e9139609f0d508cc. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ESA011718992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57389d96d01888010d6edf56fcec09d6b81630723a19ed25d97f4ce8b3e29c24. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/ESA011718993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e5d41ef476af7ef0db0b1eff0f25d96eb1ee199d5ef7ec1c923d3c3450e1f6. 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/ESA011718994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6f008f1280bd476d861a42665c18eaa17258d263a42c39748ba4423c746b9f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ESA011718995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa92676c28a1995f5a462583383eb81a4afb0c496813c599a870afde16c7912ef. 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/ESA011718996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742472687fa69c29eb55e367e8a0b4eab1573cd2e3dd2d3c6f1de752e6943817. 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/ESA011718997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f0ae10c0f72f54bb84af7339d6eee5a94640c9da9a07a972b491fa8ade5de5. 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/ESA011718998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d07c83cd5be50409390835b2bc58c70d7f47f6c3e4655a9043c84c4169bd920. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ESA011818230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8574d71bd1acff6473a217bd84458ba41e37ac6dd1040be7b5536c8d1d2d9a. 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/QZYFZ2459551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e28291dd4e63aa5586111086193ea8cb2008131d7808d9f120922714d54448. 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/DGA082314951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360cd088d6989fc3ea9d91dfc5315e9b0737913b552db8235496c03028bb4e23. 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/FRX282323489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63875fea97da90164853a4f41a9f4da35734345ab332241bd9290f4a24ef9a2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282377693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78d9ec6a7043f50906fc4cd78efe3b8d4e25d6ccc7b7d6f15fa2e4ffbcc83ad. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282377694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324a9b2c0108bf7246e77aea014ec9b5b98cf998cdf8d9dc882c74df696d5f35. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282377695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7d7c0c8ce6a620b97b7212f9010176dbeb6b90e57bf07dfeeed1ea25caeaf1. 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/FRX282377696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70552ce4d353431602bae636d5f6586c01b5d2fe6854ed7c8df017b402f14842. 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/FRX282377697.