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 0x9631d85039398de89657d7bbb1980bf50ac5b552a8d5934edf617007ca3745c8. 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/f483b98c-fbe4-4b4a-9543-78292174d797.json and https://artists.proofprofile.net/proofs/artist/f483b98c-fbe4-4b4a-9543-78292174d797.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 0x8a45251a50be17de748954420182c970670adf61a5e4c8555918f9232cb332f9. 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/NLRD51808144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f74657e31792c467a57157b2a80b3f936fabe3086cb26f3f311754c1a3f65a. 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/NLS241600721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab44be1d8b774dbd42eb736e431657b038d796223296ac7143dd2fc3e080f17. 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/NLS241600723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5fb205cda058b41488ae4fa3ec799dbbd4ef985eb1f3255946a1f65caf313ae. 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/NLZ541801546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96dd212ee6772f9e57c7817c320f1e89a5a37bb1f9c0380defc0dfaf3b15944. 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/NLZ541801138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef95cc4f48470def6d4f14bb284b3c91c185f6c2be7c4adaa627564487014dd. 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/NLZ541800910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7df144c407c4e80d8608c35000682f7528f23155543480b8463a4f6fc1d04e. 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/NLM5S1800179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44199219f3c7dda8e30ea3aebd10a36bfc9cacfebf28b83dcf0261ba08156efd. 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/NLRD51708118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852bc0420aa795f9949e4bbd701dd98a9034b43ee7cb7c020f9996b1f11aba56. 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/GBSMU3525368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191f46a0dad1073d6d1afe392824c39ef3f5f1f4ba547342b9be9d400ce8e33f. 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/GB2LD1700261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde51104cbe39b87abf26633c04a67149cd1a872864d5a0272be02232b0a92f2a. 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/NLZ541600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c6ff68854c501644311be441b504fc48f9ffe2f7b3c0bbe348055da107c0f4. 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/CYA111500085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3084305ce5547b57654c7da36a64796f0523e976e99a21db98d8f0c74a233b78. 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/NLS241501883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf724c41a5cd20b917dacedd28cef85242ffb3f703ae8f60ef6c822734413033. 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/NLZ541500112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad684d4ae852458bf9636fdd970076905d5885b7c11df6983c485d618d4b7dfe. 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/NLZ541500090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a8095d421b58b6f532bff58e3ae1f70416001b2a52db65e9e14037d05bc54d. 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/NLWV71500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcf5d5294eccef09cd646f5cf52664abc627edc5c6af8d01b6a4fe669f3fe32. 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/CYA111400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeef05edf941a35775531fd63940b071905e52eba2be58fb3e5792f2ce6aa4ca. 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/NLZ541400835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ae8b10622d6a05b74a691a813471fe93a5c728f196332a0b31eba070bff483. 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/NLZ541400846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f73b3d9cfd991b3737210a9476c62c275c3a11bff3d4942a4071f8f4fc8059. 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/NLZ541400428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d1b9b2e2ac2dcf682aac0b41cf545799dc0788e6ff1508d94432c6808bf9a1. 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/NLZ541400438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182a11001ad40c9c3599677c1e32e621bbdfa66a0794559cbb9ac8b889078d31. 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/NLZ541400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb82a7a7c0b5a2b34e7ba7d6bf4de23f0c9adfb82c147090d4c4086d5cbba014. 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/GBCEN1900009.