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 0x0337a423f8a36547be64fed70bb05d0e43cd2e7b30bc9b9148e1372bb14b224b. 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/52447e6b-99f9-4b42-989d-a0b4f3db4d67.json and https://artists.proofprofile.net/proofs/artist/52447e6b-99f9-4b42-989d-a0b4f3db4d67.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 0x72a460b342e14cd57974105192498ce008f4a3a4140c5b33124c5b1eb8ddf161. 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/TCAEJ1970762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc843879538ed02e0b2b1e834d3aca366ed33788bffcb2fdcb76e263cb95d1b. 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/CH6542106705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63ca4bd4123c81ee24b867fa0bcba68245e6d0d88c21bc85f933bdc89003f09. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAFO2147744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7491d7d290ff9eedb92888f2b24dad8afae1f7dc6323fc7ef685a7074116b4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAFP2171087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e64b19e9e26ee7913cd1a6004474f3af4cfa54dde7f0b24a04804eaf27c0553. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAFP2171092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88af95779937d37795b569ff947038bc8e221b64cacc7e4bd9335ecbb53f26a6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAFY2108427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27cf32d5b6b8e4827066408079607a13af3d1902a798d2f9145de215ec94b26f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAFY2108435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe081e047923429bbd879a1319ead7dde3160676a4e0e90b91ee4d98afc465850. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGB2281114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534f5472d312e0af2a28b9334917a3b01d82b09cd83c1d2859873e5172a0bd17. 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/TCAGP2231695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db4f6568cfd90851af5be7bfceea26bd2c0dcf1cef30072273f88b1ac476896. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAGR2200731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540d53b63d24a2aa21444a33c37ad95a0cf3e6b877708428556409b0c516b994. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAGZ2377780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064c53ef0ebe1fae21ded6ed1617457a11be0dd949034b353f56066ae9339ecb. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAGZ2377757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199b3aae0c5c1b7ff0e90e722c3944694398b73354dcdc71033343a89d679551. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/TCAHJ2302938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16e7437420786ea057dd3f21fe5e782e366b7e3968f5328df6201dffe5aa5b0. 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/TCAJC2470447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ab1e59fe5927453efd71870b1106a31e88049a404fe4e90230d5c16e73871d. 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/TCAJJ2570551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbac026d14c2cd33be1ae2ef52661d10c9c3b34b3f4dd5d01113d0d2574b4c9. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TCAJQ2547018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee622c466af5ab3b5c9307d3aa3a3887c32a473e4949dd39cf2c6b0168b49626. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAJQ2536403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0d1bb5fd508be9ae8dc8e2c84905c4897ed0bea31e8e677330b3d9fad99fcd. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAJT2590413.