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 0xa3e86ada73a6d6d3e74fbb5c5adbe01877fc4d5a9e0083606e3ed06202a886b1. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/630b9c49-f7e7-467e-8a83-d676c7da780e.json and https://artists.proofprofile.net/proofs/artist/630b9c49-f7e7-467e-8a83-d676c7da780e.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 0x6deea0e90e77927a64c78c26070584d683c44db998dc256e51f57e78eda95ca0. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/NOCKK1821010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed07c2beaae7c4f81132f37878c5dff82f69c9567b5808b15ba467d06dc78b1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NOFFM2219010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d76a716591851fdb5f90b97ad743e45195815b1135f58c4c43dc874a632b52e. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NOFFM2361010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77da34749f6255a466d6ed588e092954b3d47ab3728b6d55ed7cc5df96297a30. 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/NOFFM2428010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6079356b243f8bc642b16258977f52ae14edb886ffc64c91293aaeb9f58be6a0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NOFFM2459010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4632c1abe9db3b539d61d4cb457e3845822bc468fe423689d29253fa7f9ad38. 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/NOFFM2237010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b455448c03a84ba3499350c4dc4ab6e5001de3ccaa96de0e4efc68d0152c1a. 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/NOFFM2485010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8447c289771315e05106778337a471b02b473b232972445ec3632f9acd26c56. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NOFFM2460010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9e6f7eaa17b3fbe2fb6686b1e8a9ac324aa75262c16e841925ffcca4ef4761. 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/NOFFM2413010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b030f95180d13006bf76c43f37baba28393aa445359312e21981d0d38460d43. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NOFFM2486010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc30ea1a6e685d19ad7388b3d3641857e029fd11efcd3fc7cf38508e564c899. 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/NOFFM2237011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8447c289771315e05106778337a471b02b473b232972445ec3632f9acd26c56. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NOFFM2460010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9e6f7eaa17b3fbe2fb6686b1e8a9ac324aa75262c16e841925ffcca4ef4761. 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/NOFFM2413010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d76a716591851fdb5f90b97ad743e45195815b1135f58c4c43dc874a632b52e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NOFFM2361010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc30ea1a6e685d19ad7388b3d3641857e029fd11efcd3fc7cf38508e564c899. 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/NOFFM2237011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952d05ee7853da42d3d1e5cdbc3c2605d54a02086525e3c4e4d505aa0ed9b2f4. 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/NOCKK2123010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5a7658cbe0b01bfeccb2c973720f343603d62aa01c98db499651028d343b07. 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/NOCKK2121010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6368217b9956b43b1c14b915469cf26dcb756c9e2b6c71b5660c734a04820dd0. 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/NOCKK2103010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab629bd2afdded0c9e82e8bc1af276da3934004acfba5417350797ea9544ce90. 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/NOCKK1826010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f2d86d8ccac3e129f8fbff91a77b59d6a3587e795775d2b6c569a7f3f872a8. 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/NOCKK1809010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7464551e89bfb6ac758cc374408b5d7eb6f870c5ea3f7ee688de187eabdd95d3. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NOAGU1503010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bedb544e91dea52b972cbac356a4cb21d55034f23b73d29bdebde96486f574. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOAGU1501010.