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 0xada41720aba878a1d5e6c976fde81968cd4e4dbad0d37240b7a042cd80572682. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2fbb75b2-56c7-47fe-bf08-d2d9b35a334c.json and https://artists.proofprofile.net/proofs/artist/2fbb75b2-56c7-47fe-bf08-d2d9b35a334c.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 0xc5ad1b97e9e60937b13898c9b584d7d6c39a10d00dfb188262214a1104330d6a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEYOK1722651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cfeecea0ee45b4c7683db1ff5c19912bb7e4262bf7a0ce087a5610ba2ab85c. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/QM6MZ2192998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52419f521b1c1516ebc024e3b8211d6c41ccfd9699e2c278487053adc7ac390. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QM6P42135505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba2d08f03b7e41daa85dd809a117f8a3fcf9651361bef1d6403caa789e4bd3f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USA2B2511317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f01607c734e52b3f466b1f565320105e4cad7bc7a69f37df94f47402ca21c1e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USA2B2511318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7543e689321a112a1b12bb9f3f0caa5a15b170bddd5907c8481113f96d804ca. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USA2B2511320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7543e689321a112a1b12bb9f3f0caa5a15b170bddd5907c8481113f96d804ca. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/USA2B2511320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ab70630c49e7759e36942b6b28a505079efd6ceb5fb24187a2812f4125eade. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2B2511329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524615a416ad9dfa6745a1a84f6c71b0e615a2d15aa4b998422a339329da7458. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USA2B2511331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8041c4c136136aa7d9979d59026824ad2672669f14ec7d8ca0240c1f74c4cfa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USA2B2511332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c650fd94c8f3c52209d8cc45a4ba9f2fa7089cceeb2f1c9c04ae90f013c9ca7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USA2B2511323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe73526c7eca30697964273061f2d2377c74d60f3b6343fd5ab33d54e4ffb86a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USA2B2511335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72f36df330c73d28bfa759abb665bc811568e3188907559d7bc064c8df835d2. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/USA2B2511336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650135462c094986508fa3dd357bc35c1eb3812478ea8deba774322a263ae1bf. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USA2B2511337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f2b81e3d8e4b6e94d3b01e7068301b7a4e4b584d807176369836bd3750d6a9. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/USA2B2511340.