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 0x63efba6298dc6fe22c00d826b6c5223c8d01651b9e7f5dcf61b0383c83c233ce. 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/a0122c0c-9092-4a94-bb9f-d913a4fd6d5e.json and https://artists.proofprofile.net/proofs/artist/a0122c0c-9092-4a94-bb9f-d913a4fd6d5e.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 0xb7229e2b002c6b49617464e26bc235bf0572b8d2f177e548ca91d8af4a8e1dd5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SE2UI1202502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe7a8f58e06c4e54e69868e2d500f7b1f9a4523078c850620e904e2174a8271. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SE2UI1202401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea29ee7dfbcc38b833c2966b7885c6fa88341c44e52b865e6fe2191ad8af2766. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SE2UI1301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a935f36e3500c84fa5cc1c6a12abf548d1bc5f4ea2ca1cf7fe81bb0723a0938. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/SE2UI1301001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef745f33a8c5632cb30680b15d1b52168e712496c55903475f58bb9f4937a650. 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/SE2UI1302101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb58d5a606faf0bf69d8791338375f95f265945da6fb6221ea84c143060a8410. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/SE2UI1301801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ceebeb30df494df09be9109203ed13baae22366d2056379fdded3a0eedf4330. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE2UI1302001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206a6d1b069a68bbc40497c86ea20db6aa787c5b98bc765395c525ffff08743a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SE2UI1400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c152d1ea5d2a21f06ec7f34c027528eb0cefb9e5bb214a15c435b466c4377af. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/SE2UI1301501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c6933d2f243cf2743b05e6a58381d80a41be324b6f4b94ab3bcbea00c027806. 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/SE2UI1301802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6657ecedbe7b7b5ffac8d6a9c08ba6afe89f7de44d2fecf8e5962a073cdbaf52. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/SE5OM1802001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f4d02eb92c99a3cc146ec65da9ada619fc47eb8df5991914e42096ac853d9e. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/SE5OM1802503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26c646eae0303c913410cdd5b6cd0f8232ec2d2ca8f249cecd7cdbec5ac21a0. 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/SEYOK2100935.