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 0x6470b77e996b2ea2d6cb9a6db6ed7f9a5d5a4d5c393c4c4a8d9d3439e466c542. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f423b22-dd03-40d0-90dc-daabf6ba3cb7.json and https://artists.proofprofile.net/proofs/artist/4f423b22-dd03-40d0-90dc-daabf6ba3cb7.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 0xdd4f18f28d8d6992edb6c010fd93a3a53da9916d343a3459dcb3e3550a6a6952. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZWFL2385931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a4b8b56ed47737f88946f588cc8d536cb90e31aa75f5b7a2c252a8abc13471. 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/QZFYY2426438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb063449f38fd03efb42c7b5d700199496d1e9959c323ab714b525c9ba7976b2d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZES92410208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0035d128daebd55b3daadc4a0c0768526b4852aaa9e091fce573578311de393. 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/QZRP52433450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ea3514c0ed032e0f3e46f32b4294b2b320a2ec1ad2aadfa3c9712fe3a5dcb9. 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/QZWFE2493844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4939106eff605059f875bb29ea5d3d1bec0ffeff1a08d5ce37d3dcb19d90ec. 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/QZWFN2468988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d794e466530f4589cb477f026a729ed847d599808c9cfb240f809328ed793ca. 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/QZDA82545084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c67bd1756059d6d00cf043db6cff25505b1c01969bebffc09bd4eecc5690f3. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZHN32521117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dbc6718d240f7657dd0a718a8c2b574d9e31442479319e5767c3c07dca1497. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZHN92512419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dbc6718d240f7657dd0a718a8c2b574d9e31442479319e5767c3c07dca1497. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZHN92512419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ac87793714aca35d52f41b19fb0aea7e0a794a658aea35d81d8b372a41de4e. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZK6J2514159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac53c85cec7dc9a52c9f4ebcafac4d9e3d0ba30a7e45701ad6d3448e45514d08. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEN2561713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535ba82355aee51bfcd11b1933dda1c87e048cebaffcdfdbd6e7dd5c7ad06363. 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/QZK6P2565153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f629d5c744d4bfd62877a96cae4532db383c772c237832aafba9611d420209d. 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/QZTAZ2421707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0035d128daebd55b3daadc4a0c0768526b4852aaa9e091fce573578311de393. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZRP52433450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d794e466530f4589cb477f026a729ed847d599808c9cfb240f809328ed793ca. 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/QZDA82545084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dbc6718d240f7657dd0a718a8c2b574d9e31442479319e5767c3c07dca1497. 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/QZHN92512419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ea3514c0ed032e0f3e46f32b4294b2b320a2ec1ad2aadfa3c9712fe3a5dcb9. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZWFE2493844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea55b88d79633b4405baf459af1de5db0fb005d327ca87132387f1967f6a017. 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/QZNWX2501108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6116e90afcce1052ee217482552700b8a78ae1a96a134618fe7421ec1899b439. 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/QZNWT2536041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541a557bedd68a95ac43b0ee39d81af6ee2e45e031bd0690eda8bd9f7025ec82. 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/QZTB92525676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb44215bc2749be99ff85dff5e38dbb869818e380de1127e7736765e6087953. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFE2579094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d640ce36875929175b5cb0ab8c72b96321e789c769747fb4cc7e173a5eb109a. 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/QZWFM2539123.