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 0xbf3a5a9acb450087ed0a56c742df0c3029dce69796116e1ba9f29f3b34a32705. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5afc2d3d-c4b6-4fd0-bfd0-5480cb37117b.json and https://artists.proofprofile.net/proofs/artist/5afc2d3d-c4b6-4fd0-bfd0-5480cb37117b.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 0x3c6d6e415eb74f17a6272da12842269767a63ab68bd810e3f802d3241f658a55. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCAHY2493023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b56acdecf113cf5b7bb9ebbbc032c62177d198ceea5818f1ad6d5fcafa7044b. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAHY2492832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613d8adb8da4c46e83a134e984ee1387ac342136ca04c700908aa1a000a329af. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/TCAHY2492835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d12e9d992fe4d7bdecd3e9b5bfb6685f0d7eb724b487c5474263a6bc3c1ec53. 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/TCAHY2492839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ebe3b4c93bb2d4be7cce43d1f86e4f0ffe7426e5c080e29ea4f3ec97867e2b. 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/TCAHY2492846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3e67fa51e42231f3b9d72a6d4407c6b337ad78172b0e9df9cc3e87f237bf98. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAHY2492849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd673dd8348d7318930a61f3e143ab8d644cd68999c6dcb71333f4bd0d1550a2b. 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/TCAHY2492851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711dbde6d44619da744d7069271e0dfa660427c435dbccff1e7498f270c7bd30. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAHY2492852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdc24e31f2c44c1f315b3de779950c9b8fc49c45abe9ec781033ed4f8f772ff. 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/TCAHY2492856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cad8e806f5073133ed6782d2b730a6938088783e74ac23ade9ea6f5cde5bc7. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/TCAHY2492858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f00c293514c0e3df400503183181e668d3aa172cf8dc97d4c5ee9667eb4dad. 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/TCAHY2492861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a135f7c8dcabc5e25597e3d1fe6f12a1fbaca2b437ac88e2c22f2eea1096cf. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAHY2492863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa20bd45ab98ede32010295bdd4c83c84ec1c4aa1fe8e4f7770cdc6811c5f471. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAHY2493052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9274fbb6e152d59f5d94dd44a91db30b38e0a87b039b58dbddae166322f70a37. 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/TCAHY2493067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeedc2b4282d1a3904820495e2dae7cdb7abf624972fcd6a5a5b585a53687897. 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/TCAHY2493095.