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 0x162ea80433af0bf15d4fdb95565eaafe5f45b963e03adaa967cba93afbaef33d. 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/3f06019a-8866-42c9-a8c3-fff6eeccc7fb.json and https://artists.proofprofile.net/proofs/artist/3f06019a-8866-42c9-a8c3-fff6eeccc7fb.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 0x053d9f237c771712c598199447ff8649325f7763208f8af763c2a1e1025bddd4. Chain 2 (Bitcoin): anchored in block 957554 (2026-07-11T10:39:45Z), 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/US7VG2137255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cbd488a3fce52d6a2240d6906668702466021244ee0129b403274077779b5f. 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/QZHZ52110577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a626a02f2d69726301f8b3eaaf77cf8b92c69c23dc792a923f0278067a1dc76. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNJV2195297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f05637564cfd63b7c85e9c3060406322bf2bf545a4356c204c17cb61f28f68b. 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/QZNJX2158229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a504d853cfa57be869e15ce1f756387ae8294aa89ea3bbe6a8ccbed3e3ae58. 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/QZTPX2195847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc8650887edf3a4d56a0264cc042b1bf5ce51fde0b94aaa0c117e72503b93b7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTVM2151638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8b7b97048e9ed7b10a887fde477cf55a3c7240f1f68e049b4eb71ece2666cd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLAM42200175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055a826d7fcad2a9d2b23111af9f9ffc60a7ad7794d16aae487a725da78afa3c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/NLAM42200176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198e22b35d50704cd8d246733077c365a467e0b819d607357e081015c37c111d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/AUGBT2218858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a4998b7b1dbdbe11240d9fce7de3a6b50837b91c730c3804aa922ce0dc182c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AUMEV2312775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79493dca8934bbb1ed37f4aaf3f4f6f8c14b87c62b80dd58011d2d21920f4096. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/AUMEV2312776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9f9f69033e03ca71638a518562a77bb3b13547d40b076484b710cd70331ce7. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QM6P42361086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4de524e513daff632f8ab2f420539b682d827aeab52557e3fca1b7f8c7facb5. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QM6P42361087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7363d26cd4b9d9fa29df9c888509c0a018a95796d4afd92e15a2e6f3237d1b4a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6P42361088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433c72be92f44c600dc704709aa178291d1dba70a3d8418ba22c02e20e3c1abb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNJY2347170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e346b35b8ec8eeb517de34f625d1c65f1cc7020ff4a9d06c8e5599967530c94. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:09:38Z), 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/NLAM42300366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89414fb028bd73d1cbe53a964b65dbb6861ab589e6f70eb678023ddeca3bb773. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZNJV2414577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4165dfc4456efea859fcfe12180164c9f39d881e0589920154d06676571aa6f0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJW2470872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cb802162abbfbeb8583789f105817dbc5e5f6bbc7835f873323518ce7a7c3a. 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/AUGBT2523913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ed42402f3c9ba9a42e1e4fe9a4f4a21d9276b649455bf6d2edd997b6e356c1. 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/QZNJZ2540293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbecebf316417d5f162fe73f267dbd8d7dadbd9bd58fd26b6db2cb64a057245c. 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/AUGBT2416509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9949fe2a5bf2cb2680b57d25fbf781009e730899bc0ae634bfdb004f57eeb8. 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/AUGBT2210240.