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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 0x3ca2d0ad0eb380f25ca1c70e6c9fae718a0a8a316f2f63d305b116f464c36043. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de99652a-6c63-45c4-a0d4-532e567e48fd.json and https://artists.proofprofile.net/proofs/artist/de99652a-6c63-45c4-a0d4-532e567e48fd.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 0x6fdd13f27e0b59b7d9b92fae05e8cb7ead19b09904cbe1560f1452a4a4c00ee1. 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/GBKQU2091870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6dc2d8b295b34828f9c15a6cb0344fad98160010990ccc4577a58f85588655. 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/UKR6V2076381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e50ec1072c57c72be010d9d1e44972603515be3cf2903b37e439d39cc24550. 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/US83Z2116419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e59e2b2a8a8d94a4a1df54a5dc53b6f84b03ed40138d9e8af911fa8022238ac. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US83Z2116421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75edff70defceef79df6c8d97ac11e03eaf9e62f28afc58a7bcfedfe850d5800. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/UKR6V2174782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b672b2adb8c99ea42f3989468944bb693111b9f890ed1312e962e1efae6747. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/UKR6V2191595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb31f3d7cd8a81e6c5e1847b65658118089c65fa05f3bca944c88b5616162ab. 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/DEAR42188257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a35d641dd3c2744edfeb4e423065c88558c9e4961a0b376c1968f100d7bad54. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CA5KR0004487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d81d33ea66453bb600797f2ddc7e711ffd8ef4dc9b9277a993492cffcc7d560. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/ITS252100089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1885db8c38f038acd618f78536ea3606ecc531060257e91d33f31b53b50f1301. 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/UKACT2233080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd95016696727f1d0c864ad0c42752ddedef68410f80ee614e663b9498b9a74b. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/FR10S2329094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f329ffb9882cfeca540a9b9eda39ffdb927daf88df76317a51621b4694fdb7. 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/CA5KR2381739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf082d117e56ec0324bd31b4974cfa7cb304de5f3aafc8fa95cebc3b81b05385e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CA5KR2466986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5deac970accf177118fe43ad6a79f3a92f5b5d8c59d3f721c3450deb47fd16. 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/UKU932401128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa724457c1b546048b4b53ad7679d8a3c419e66b6a5cc4739a74ec5b4219c04a5. 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/CA5KR2515389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3944e24099cfc6e9e234150641f501a6671529ba8427e2a4145fa94a6fbd743b. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/CA5KR2526945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4e923f27e0919986e430a520a58c462ff33b6578a7a5c6d3cc1a38d67bc3ee. 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/CA5KR2535915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcebb862b9defe882f5f542cff18be73535f467a6b775d4c09b9a896a29ebf65. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/BK4DA2524676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61adb44e70a4e4fa6ff283bc7e2f03e6a9b12e3e744ba745fdb2ea81412760a0. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/DEH742302310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8d71cfc36cd617d3a46e93c6329fe941c7740157cd88d3868f9d38c812063e. 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/ITB842200241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2204f84ba66183ccd329e971b57b1672772e1672a7889e3ecdcfa39ff22e38c0. 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/GBKQU2330437.