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 0x2285225ea8a5de99964bc7a63d637f3ea740a77f9f03f90918091b81cbde2b0a. 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/946f2545-fa91-469e-bada-7a09f334988c.json and https://artists.proofprofile.net/proofs/artist/946f2545-fa91-469e-bada-7a09f334988c.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 0x96cd850438e628f6e9dc7222ce27479395edb5944ab641f761c7095b5bdf6a32. 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/TWCT52325514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e198688c4cd0dd6b1796cc54ac9c6c2c1ec368cca3f11c0be85298f010c653. 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/TWCT52329743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb71f3524eecb0dcb5ae270472956f3c756ff4f12e5cb99a52bf8c439b9235e. 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/TWCT52327086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d99d4c431b289b28c196e7f388e2002125f71f08feeaee6743e0fcca20aa38. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TWCT52329744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566019d0de90408d45f26f31cd5db65372e5bdf94a9b06b4b1a51e2676ed0dfe. 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/TWCT52328958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d652ad5c8fb75b134f82e5f8a0435205c1742eb4960011c6096c82d08922aa. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TWCT52329745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6a49a7466b788499d443784c0638205068834f96dcd9c5db30d2468f8f86df. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWCT52329746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad52aceba684633bcb296c30366fc4016682c6520221a69f3c330625c583ae1b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TWCT52329747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd3471cddf726f551419947db8da7d1eb4f93c1ed430a06f4437c6092872b0a. 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/TWCT52329748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca550a842d0467e9876beead20201293c89b7f3f730d638d32f3eb1a8ad11610. 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/TWCT52329749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7934fcdf6da3eadbe6a0f8d4164087b9673d45c086ef84bd4fd29266594d7d9. 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/HKG731684588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566019d0de90408d45f26f31cd5db65372e5bdf94a9b06b4b1a51e2676ed0dfe. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TWCT52328958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb71f3524eecb0dcb5ae270472956f3c756ff4f12e5cb99a52bf8c439b9235e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWCT52327086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1639ab43aeb270d6dcbf36ccdb88ff4e2bde5f70d49b7809a4bb2e8d4b699ba. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TWCT52321094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7f03e58eb6dceae6d0be431707422f5002e06f77f7e112fe3d37c91a50696c. 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/TWCT52207592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c5620574476b4a242897197850018fb0d4a2db6cea1dd890daf2b1c98f9d2c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/JPU902105127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778c6532c0f11ab15af5fdd59dbbd53f9b0a83bf8fe25a0bd5d6f72bf45c47ad. 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/TWCT52105901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf4d73b30cf285a6b1bf8cd5a847a2dd70a963d4681246fd78da12771db1dc4. 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/TWCT52105470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a5b2cea88ef301000e701a3ad3b65d287d64296b1b7188253b9f784b3ad240. 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/KSA012280176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c5620574476b4a242897197850018fb0d4a2db6cea1dd890daf2b1c98f9d2c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/JPU902105127.