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 0x5251f73bca21c89c4d735ae3f18dd3b92221bf19db3aadc5f7a8e90b33fe163b. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fb3bf4c-6278-45a6-9b00-f2358f4f62ad.json and https://artists.proofprofile.net/proofs/artist/9fb3bf4c-6278-45a6-9b00-f2358f4f62ad.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 0x62fbfd3898f66dfb23afb39d7a56065db8927f5921d0aa55bf50d2a501ea53d9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CH6542370115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8ffb572014b59180c1331a32e71528b35c4d0c2fd979c3d416e5bc22b0231b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/SE6HN2251996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae4af25dc33335ac79c7345895b559ae408c36d6c2bdbc3eb2f402e08e3fe64. 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/SE62M2140588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3073b78c19e0cedd73914bc24d739e347c0be1aeb5a13a6c718be5ab26e751. 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/SE6SA2183483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ee6e873afe4da483498b4c68529dd50632929d6ce6ec9ef71b2f73f6a609b. 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/SE6A92166288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c805e9ff046702ae7ee435454aca926da8cb4061dd506a028a8802a4717f3e5. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/SE6HN2005176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c6b56d36fce547714f63c42d517b428ea6bbc044480e465667cb1356bad696. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/KRMIM2350948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b313d4b5605e72efe907dbd3e00a3e4727c623af3845d8755dde3d8347ebdc. 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/KRMIM2350949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbbd85a640d2892dcc91ffa547954ca1b5963a1887aa5541d57378e813cd747. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/KRMIM2350950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d59fa2f2c0344746a2022660ba604a4961627afe289a879f26250a22f3ddee. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/KRMIM2130867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37085b94c13a928c22ad522d4a0f18f6a32e14d3bf92ec2fd740990b2b11c922. 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/KRMIM2350953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff8cd2834a7748d10d88125a2ec50f02e8bd0452204e268d82d8863c2e8aa75. 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/KRMIM2350954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901193e22d3073afb3efe168e1cc84aa07b78e1c7756b389a712eb140e321cb3. 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/KRMIM2350955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3c35215322292919a4ddcc23588bfb8d1ef5880e2d660292a2dc8771036617. 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/QZ4JJ1837481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b2e59012e2c980e6583256f91c5964ebb33d4edaae98d0c3eb901a2c5e6ab4. 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/QZES72179349.