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 0xa748eded1c97376354bc3825e4aa167d4f4ce307c5ac98b20d321e2af3523a35. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23a2c190-5f8e-4708-8ff1-864c711c4336.json and https://artists.proofprofile.net/proofs/artist/23a2c190-5f8e-4708-8ff1-864c711c4336.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 0xe131798114e73b346ae506508ca0d65a0ebb15be8bfd74b5410aa0c451ee079a. 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/ZABIV2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ef95e5e189911c257d26c2f071aa7a07b9942d75ae59885b9930510a7be809. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ZABIV2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5935b56e5f69971f63f8490ea88782156de524f03da564cce72f89024eec174b. 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/ZABIV2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bed5f8c8f99c0278bfd5ba26d63ed02251512f7298a447ffd8dd6e9a10a30d. 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/ZABIV2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f91ee20a67710d0602e4098b0d33c54da65f6b39942522e4a4e13161ac257d. 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/ZABIV2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845302085b5c29f7a2fbbf67a9ffa0f11741741585f001f8251f48a438437335. 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/ZABIV2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c5c7fa1ceebdca4d6ded0c00054fd18fa9b60d418b03bbfab261b792f4f19. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ZABIV2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d09457c963c365225777925deb69ffaeaba011698f60e41a21e9f0094daeae. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ZABIV2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28fd7d838fa901b1c48e3da06bf821be5282edf1cadec0f609f15365c493f8b. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ZABIV2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439ee0a75587608429c774ff6b9a7623d65537e44581fb455b6db7a62aaff1ee. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ZABIV2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12db366cd6a2f7db9faa49e0d1e1cf4bcc9fee4ca10cb11d4617a69590ee1a29. 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/ZABIV2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a01ca9010fcfa447978acddf32c794a6cc9f31b25fc741920daca3d5e39fb6. 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/ZABIV2100012.