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 0xb2c7eb9bb897239d21badfd7ef5a165e5ec457a489cf08df64d33ee0382df4b6. 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/9aef6583-ca9a-462b-bc80-0399e0127325.json and https://artists.proofprofile.net/proofs/artist/9aef6583-ca9a-462b-bc80-0399e0127325.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 0x6c70f4e0ce274fbdfd0f51c08672d6393951eeb9d2a2eb1684f75560bb986d1a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES32E2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0242c472886bf03f308ecf5edf89ca100a3c9fc38faffc9e4e558042407bf0b0. 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/ES32E2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb66f401aa1525a055d651fb3aa86c2e047c77c045e703e1320e5db49388cfb3. 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/ES32E2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f8e1f78a0783734948fd69df5a55ca1560e66cbe9d29f6af0924ffbe9e7de2. 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/ES32E2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a22c18157292722ab1eaacedc8bf6e6cd42d608994435b2f523507436f12d1c. 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/ES32E2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb41645c9644ebc64031d89d0d8e9a0301c770d76081c0c9c54badb800b0144. 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/ES32E2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd03127f1c09c8ed66b615f9ef7c02fabedd9b19e144a5245f51b7daf885b86e. 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/ES32E2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddea9fae7cf81ffa0331b2d267e9ae187788b9f07f699ed80cc6e5f94b2c3516. 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/ES32E2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5def4cb6a51f29a20a453edf21cea8888fde5630e1b319a85e3dd593eac862ca. 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/ES32E2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e625db1d9e8cbe8bf7693fb70d8417c7f60018e2b5a09190627f39cf4c35857. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZNJV2423117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4c396c12a2c77857be1eaa89d8bdd6ffb26e7bf198294f187c3fe6c346aeab. 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/QM4TW2451506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddea9fae7cf81ffa0331b2d267e9ae187788b9f07f699ed80cc6e5f94b2c3516. 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/ES32E2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb41645c9644ebc64031d89d0d8e9a0301c770d76081c0c9c54badb800b0144. 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/ES32E2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca79e13454ca444eab5199793a6c180ad770fc45995bbde486281ade841d403. 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/ES71G2316267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a22c18157292722ab1eaacedc8bf6e6cd42d608994435b2f523507436f12d1c. 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/ES32E2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c70f4e0ce274fbdfd0f51c08672d6393951eeb9d2a2eb1684f75560bb986d1a. 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/ES32E2300002.