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 0x3d050b9b2813829f93d816a252bb2d7f4ffd88dcfca8c8758c2926ef2a904fd3. 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/b57bff80-59ad-4976-93b2-f4b4074cfa4a.json and https://artists.proofprofile.net/proofs/artist/b57bff80-59ad-4976-93b2-f4b4074cfa4a.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 0xfb1b057c97d6ba2e09a5c8063de3e36178a8be9ff71df38e4a575faddaec3615. 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/TCAGK2250375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b8ed0041f8e3faf5cfdd1e48d41270892b6eb9131d521f664971451f6e2e3f. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCAGL2220821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc961ff15b28656cc31fcec885614825652a4a1e90681f846af536c9f15c15a32. 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/QZK6H2356919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2d41182090ae06e9ecb5e898d0da9a49d5c06513c497019c117ae5d2151ff2. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZK6F2385426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247557b0865900d3eb34ca0f8f3b18c9c5eea7ebcf0a5b145acc905d04f65d27. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWR2326326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d4aa3509bdc2292d27fb3babcd1a349e1cb84e827d5d62490871fb5938451d. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZNWR2326332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb469527636ab037ca1ab02652a7352bb4a5152c36cf7f077823e733a89f202. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZ5FN2331819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d3288260d6c5b7379df5aaea88ea6b14a03e3f51e2670342fc422dd3588694. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USLZJ2303920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4cf4c21d8fa7f5f26810da4bbfe402c0e82558eae41a475cb80a42c0c8bfb6. 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/QZ5FN2448282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63954591de0e850425184e932941c7509eac4544ce91cb8ad1b5d899b6c999e. 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/QZFZ32469907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed3096a696fea7ba84e22422dfdf1fb8033f312441f74e27aea899688afa5dd. 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/QZTAX2453350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346451971a560d5b0cfeff2982d57364575df80d886fbd2f590bbdacc6ed9fed. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZTAZ2406134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c64e4b07700648378832c277a02996afe8a7c38b0f6efe65f5b969ef4afe58. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTAY2492003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8265d101ec49b4734ddacad2863c9d50a5fddd60d03dc25849db096b515162f0. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZTAZ2418087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf6c68b2bdf6374dae0103dbdd692afd497c57b32b8e0ea7b2f3821a61af235. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAZ2419195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17d5c444ea34e492b5a1977c9c17e921d71bb696b290ad99bf4887767600645. 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/QZWFL2487294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b051cbf55d232408ad70b490008066b397dafe7f06bdaf137b1b0be620d687. 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/QZWFL2487295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a274a33b6a1f5654d33a84127a4f49f46b5d0a4076830b4ccd2d310f728d0e9. 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/QZWFP2488120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5ec8858d35cae39b1638df6cc642b11c3b11b8233c40571f04daa3357c207a. 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/QZFZ62552825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238b0ca2cf15a0b49758fdd7caa630f6166f40fa66c277db6c74304741ed5773. 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/QZFZ62552827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed3096a696fea7ba84e22422dfdf1fb8033f312441f74e27aea899688afa5dd. 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/QZTAX2453350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59ace493f29fe98c9d223ab1018a7a15c4e8c1ded6e2dca83fe895496295640. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZWFE2551281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2822cb1ea8855d20de417516a4e2a5ef2df555d72464e4fd374385c4baaa16de. 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/QZWFE2549091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5b5abbf40adee86d66775b2afed3e9093b52a96ecf03c3a35fd483c7b92e91. 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/QZHN72425559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06398cea9901d38e056382294c9238e1d6c520ff38c4289573a25f94a5dbcddd. 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/QZW9K2387865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf2053885c74e78199da95a23a3dc38741cececf72810e83288356bc05a1c24. 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/QZW9K2388977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7c598a525ed6d4f38e41b4d0474f2e0f09b18af7aaa7094766afe6e6eae051. 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/QZW9K2388979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06398cea9901d38e056382294c9238e1d6c520ff38c4289573a25f94a5dbcddd. 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/QZW9K2387865.