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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f92b2625baf87a2c641bb1269c81ed5d261fa07705bc9bf64ec0a0041e04056. 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/b0378513-ed95-4259-a876-dd157d3962be.json and https://artists.proofprofile.net/proofs/artist/b0378513-ed95-4259-a876-dd157d3962be.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cb099ad15f15e024534931ac7d16fb90b21fa5ac6f73815bebe2a2585451b3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM6N21914447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1d9cbf6aef4ef3c3c368059e9c2c33fdbf250e498ef69b6299595127c380bc. 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/QM6N21914450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246708ba3b3367195b2c268815d070de379964329418de28db362ac8a327705a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QM6N21914452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d11317b066ed1f03d0a83fa61ccc679bebed79a9352fc5f092e56f7556f958. 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/QM6N21914453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3169c87eca659c3b8bcce52865214fae21c7014d24dd83a0c3027c1517697a42. 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/QM6N21914454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4ec98b7762c1df9fb1acff9773a8da00e3c1080338efdc5f7de2dd5965f3ca. 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/QM6N21914448.
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 0x1e17ed4cdc6223d34f4ba8cf707703ead3cd951bef6e03ae26e1af635ad59578. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6N21914449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43073c89940f5b9ed58205072d081b519bb585499a4d79e632af0821e4e4c731. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6N21914451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9d1052fa99099a325ab5988a001a974e20a76613cbd15a307accc874742d6e. 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/QM6N21914455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9aca43586c57075e21e33691a3a979724bff7d51c49fea05bb22a3059edd99. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QM6N21914456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c8cbabf2bce069dbb31b5fa1c3f6b91f4e64d44a739aeb1a9f68463039f744. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QM6N21914458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e20c615e16f43b51a90d323147910a4b9af3d23ffe15d0f731643e1edf99cc. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM6N21914459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7042b2ce07b62fdcf9f992e3f1c802d9b1a5398f413667ca0d632b3f1a8706. 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/USF281506101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26f1818201b0117d398665cac50f3b6600a855338f26dbb2db40858669718d8. 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/USF281506102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346d33a0588705e10fbc071bd2320683322d27f0c396fd00e902f03ff4a60824. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/USF281506103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2690305af996f13c4bc28b85aa711f53a3e06feaf87ec8c3c9c99c69c40ae5. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/USF281506106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92c03af3ee30eaf0b89aac5a496dad71ef64cdeaec319d55fe3ea6a6de4e59e. 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/USF281506111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a58fca0b97547dc9e7bbcf37cb40440d3aff20d64f910132521b117e632f4f. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USF281506104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe248679f174ae35f8afae27fe1878a7b37b43c0cbda1c8aed0423ddb330e54c8. 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/USF281506105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d84b9be20295b48b3be7ad0baf2a0d9f8937fe4361cf4222577e7e9ded1893. 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/USF281506107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc369b38ffb0656d9d309bee11a6dc55d2a538202ed8e79b851cbc04606697173. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USF281506108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125c77e5723188d4b1c4a60ab36bc8fa39af0de5c065c748b0cc4df74791fb49. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USF281506109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5486931fbc7bf1ef6047c751fba49fb5e6688c77537c406074d9cd04e5be90. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USF281506110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded011c17d947576eb325bd0b8cddc5d36e6a8f1d4380d10ba04f0afe549f601. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFT2120525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834185acebd9d08bc4871756c966fbe338b70905c7c320fad31de279768541ac. 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/TCACY1758454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f48aae45940da1566e903143f9c07f90178fa7d8585e351b506dfcefad8e53. 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/TCAIZ2443953.