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 0x34f10c3d11c6b0d06cfa7e1c0145c04cde3e54d06361320530521b67fe7d39b0. 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/7a2f136d-1a33-4922-a270-f66ed8012a6a.json and https://artists.proofprofile.net/proofs/artist/7a2f136d-1a33-4922-a270-f66ed8012a6a.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 0x66f6aefd8d07f90c631925939d045e750729b4f96a72e630fb6b14803a6f3661. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLZ542302115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7427f1b8c473ab175c987fd81808865afec7d38ae97409eaa462f6a8e583fa. 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/DKZVA1661161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af11a7a78db939bba87873f4a021ffcdc85238f2deca8820986ba9db0c3aa8e. 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/DKZVA1661162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e15128b633d87449afc52a08d20eab2ff81d987e206861c0b4497ec3bcbc517. 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/DKZVA1661165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a1bec0fd41f813f7f451de2e65eac3bac98264d203ac52b4c29d98a72e6b17. 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/DKZVA1560745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110d7fb6edb4fa9e344b82237d874fc547113c99b9e142d1e38df7848794ed90. 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/DKZVA1460652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ee018297c28a9b0ed050702f17e232c95ccb15c67de73e92662068e17d03df. 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/DKZVA1460653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61804b4ccc35973ce5d6709a9b5f2ea6b2dffcbc3ae51a2ab20d004089d024a. 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/DKZVA1460656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df9929959a56e74d338bc31af7fba3b8bf99bc059a793ec4ca4cf0b1c1d6d8e. 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/DKZVA1460659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e6859c566158d19981bdeaa64834fbd4d23754aabbd7b518e5cdc843adf617. 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/DKZVA1360330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c3e85a64d3fc1970dc1a0177a318e81586da1108e80703d4b354ddc02def3d. 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/DKZVA2400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd5083614aa44916e41aba59e6c2ee07852c737f74725ec522bc8314bd19502. 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/DKZVA1962517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaf682c46d5acaf6c5ed68d79b734b9ff403de60a459250c7920ada303cb52f. 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/DKZVA1962217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdafe2ff6617ec4b7a75f8ff06084ef662abf01b4685a2a81cedcb7122140af4. 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/DKZVA1862029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761eb8dd8713b53ee349bb0c25b9328326b88728c37633dede3d8a3407acdaa2. 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/GBKQU1828266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d1f100c4c698f45ea087f392919a51423ead262bdfe840f062761e151142b5. 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/DKZVA1861702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc0d6b96850f878a31253eed12c12184dd91c12224fcf92654da69f00bca09f. 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/DKZVA1761563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7c8a621b4feceab46d657f30805ed3ba60f350e4c108914dceb5995b6e0831. 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/DKZVA1761523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602d45298e63c6a0125e262a2d890b29c128d0c8d947776e27c5008f800de41b. 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/DKZVA1660999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e79f9dbafb775af20afa08d6622d6d35f6a8fc71b9413f618db3c611a31d11. 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/DKZVA1460505.