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 0x621283f48d6e9f25bf489115455d8646dabde4e83b4e858786484d3a8375097d. 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/2e6acb3c-1e5d-4d2a-a72b-6c3d08fabf5a.json and https://artists.proofprofile.net/proofs/artist/2e6acb3c-1e5d-4d2a-a72b-6c3d08fabf5a.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 0x9aad96d05fc832d4dd60672c932c1d5a6fb108687725030eaf80e889910e1143. 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/BX5UR2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311f58431bd4f9c1167ce448eca071432e6d9dda541f3220230c8227aa7e74c9. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/BX5UR2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c18307c5c8b3bb9a80686c352ec553cd508c6a0e6a3e72745e7414e0d79e47. 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/QZHZ52209689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa189cd8650f4fff93df37396e3b10a3cde7bbdc0502027b11eeefb106cd2c963. 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/BX5UR2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84154bd38e510b5481f934f3b5283fb9fab7a672cd7219233ce385e10d3f5fcb. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZHZ52209693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4336c2a8e41175c2178b903afda75ca71c406294c86a7753c4b70c9809edbb2. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZHZ52209696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4412cc7f2d0422203a81e19e741d741ec9c92f8aebe2d71e4d317c0fa3adeb. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHZ52209697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f3a69ad8197abc344ad17da52a5d75b35b50de0570ba8f943a3de7632d3f70. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZHZ52209698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f61c79d86e4f8cdfd1209f636c1dd6842c579fe158b2efd9616b6d0f5e243b. 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/BX5UR2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd65b8e03e868055857b238e553fc9c36b1d68e1078023b871faed6f60fbb0c. 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/QZ5AB1816862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a488e9e92b9e1961e8b94e1cc62372bb18b29723673d1b51adde426b3235ff8. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZ5AB1816864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97b9bf8972ffc1fff0ca582a1869b20fafbdd506e9408a45a4c1a1a876e134c. 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/QZHZ42214304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a2cebcb55dcfa8c7b2c982d579348adc41ffc5483a2dd9ad1654b2c3fbf434. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/US7VG1971439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0329c1066206766b2ad42c9036ce3bd8f0c2950cdedb243c5dfd2fdef5f6495b. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/BX5UR2100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6242f975f6eeb5ad74734b9d5302e708aab77d9900bb619e522fba7d9bda732d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/BX5UR2100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1dc555f7b4fcd50bc29974c2a51a0f7703aea401bc1733450461915fb25632. 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/QZ5AB2277387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01b5fa5d20379bf9aac5cf842e4c8f701f73563ff8ae654b78d09a25cfa243e. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZ5AB2277388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cbb446a55fdbcf38dce6a662a44346e246f025e3d0a95031a5da61624577e4. 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/QZ5AB2277390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71a61a089b4ca15fe8bdf0d2b1c188f72bf9240d443542f82217cbde130bd7b. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZGLM2041587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66466b793d944e19153adcff8e4b63a4ef31ca34a851e2f89f1833cf5c81694a. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/BX5UR2100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf975cf12f426aed0d4d985e688c7bd85b89095d38bc245b0ff1a557de1f97383. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/BX5UR2100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc450dfb8cea2d02fa9160c55f0f5c28f160f47922ff7e29cf41f045432fcdd. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/BX5UR2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6273ebd3dd4678a395ba03d928f2f06d3bd4b215bef1f08a1ac5e742023c968a. 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/BX5UR2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3e73432b342646f6841b119ebc4e10a590907a86d381eaaf8b1d5272454155. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZW9K2414186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc48e1395ababb2b349bf8b28bbb6e11e24ded893013cc7b7d05e9ccd66df9e4. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZW9K2414188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5733254fcdad8d50a4519572fe53e0a3ddb43e65d871f25655c8097bf6c5480e. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZW9K2414189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa559936d297962a056c8fa23b2b8668b1bbe8389250fda4a355e1cbb9ee20061. 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/QZW9K2414192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87bafc4ec7b4171b90285a6245780a4d1d3881781631cf1a892f3456a3ec699. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/BX5UR2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b423e8b92f24d393c031fe8df896a9fa6d73de403b4bb260130d92c896862d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTPX2559658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e679137b35561070ff50ca69b295ac63d71675bf739cd2b4ca6925c4a787928. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTPX2559660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d561eca912a8c4d953e3dbe6d918645f83d1fee4eb5b498a46b363c50ce935. 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/QZTPX2559661.