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 0x19b4b6b562d3c8920b8bf15a1f2ca71784d55ded24ca8ffe4bb3b185a04452a0. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9f016bb-0871-4a26-82bc-3b8b88f4279c.json and https://artists.proofprofile.net/proofs/artist/d9f016bb-0871-4a26-82bc-3b8b88f4279c.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 0x963a204fac8726e6582c2f9bfefa53c3c9d0e2c5b21e89783cd1293a7459cf77. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USCGJ2396623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775b4df39703a960f3744de6bac7bb29657fe2610a20bde1547a2640ec59a516. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USHM22144225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ab53234dd655e3f0f691cc25894d6d14d9b8b6624b12cf658b612ee4ce1f7c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USHM92233870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c200091a910de0c8db425bc9064a7244426b65f224004c020fa402635a1e136. 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/USDY42349396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6583abf19062566f6c9d0257d5679efdb73932e473f0a0187c4c4ff5df8f1fd7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USHM82122542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc08d9135da0f58d63e7b30ad702b6704945a2ea8a9891a47ce1feb850f518c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM92233871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413cad88301e3f130d727249b7b6bcfdffd2ecc5f3361857dc47b548038402c0. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USHM92233877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653e8edc1d542c23b6fe36569d1a9bc98f76b14c7863080797ca0ad6fd8edba4. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USL4R2140974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e65aca2c0516adcb7d5d7e9199f653f51497defabcdb89923adca51faa06bca. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USL4Q2415322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2565d6f973d86a73a1797f22a14636503c674bccdbb5151d5d101b2da9c68044. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USL4Q2410461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f017582ed7791d313f40cf944564ba2760b5d2b11b72a24aa00cfca7b1978a0. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USL4Q2383514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e740a14b5ad9147cb847cd4f83bd8fa8c1c086a90407e5cd7e54e9c31d45c07. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USL4Q2383515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0233be23829d67a53edeaeb83d9ba2bd27c4cb04bdcb05f30ad613e1f219365. 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/USL4Q2383516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4186639ded4d450a943b05d2e96fd0bd410b7efbe3ac7d3f4476b2137c987d3f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USL4Q2383517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76957f50c4a59e9e1459bbe16c4ec1ef3760029c1fc15ca3f75963fb71622e63. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USL4Q2383518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb514e1e9f16306cdff6186cd83c2500ceb0dbeb6e56cd01f35200a7960ea1603. 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/USL4Q2383519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f2ed079d86dee76eaac25f2ca92ff67c0a6540f88534fa27c6935e3c6c0766. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USCGJ2396589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963a204fac8726e6582c2f9bfefa53c3c9d0e2c5b21e89783cd1293a7459cf77. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USCGJ2396623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413cad88301e3f130d727249b7b6bcfdffd2ecc5f3361857dc47b548038402c0. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USHM92233877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc08d9135da0f58d63e7b30ad702b6704945a2ea8a9891a47ce1feb850f518c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USHM92233871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ab53234dd655e3f0f691cc25894d6d14d9b8b6624b12cf658b612ee4ce1f7c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USHM92233870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653e8edc1d542c23b6fe36569d1a9bc98f76b14c7863080797ca0ad6fd8edba4. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/USL4R2140974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6583abf19062566f6c9d0257d5679efdb73932e473f0a0187c4c4ff5df8f1fd7. 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/USHM82122542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775b4df39703a960f3744de6bac7bb29657fe2610a20bde1547a2640ec59a516. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USHM22144225.