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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 0xf9625c1f0ce026c085acd59e76a12c0b36ef50156373fd87b73beccfd5114f9d. 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/0b68cc00-8742-484e-8fbe-3df5c3946dd7.json and https://artists.proofprofile.net/proofs/artist/0b68cc00-8742-484e-8fbe-3df5c3946dd7.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 0x7f2f74efdd3360002d25a20f09cff763acfb49af307d95349080d4f6cb616a20. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCAHB2397344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c016c6f96027b596f76f87080dd5be40a80de20926b96f9f069a21dddffda8. 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/TCAHB2397350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6602b7e4a3df87a0632e57d9446239593be41a9094bb01bdf3e3eb10222b8928. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAHB2397354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee024c9eb21e75380bd0a38e2239eabd77c62139788a0ca91078e3ac167cd3d6. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/TCAHB2397360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7412ee5389f64e96ee3c36e6de154138751fe1a99b278b19b886b274bcd64f16. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAHB2399873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc457fc3d04ce92e3024de205828e905573d6709fb80118a775b6c62749a87675. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAHB2399879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe983eef808c50220923cde55479125e31db1a12bdc285d926f289f330bba936. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAHB2399883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0210007300ac10d8104ce42cbb1134f5b7efd603663d1bf3880daaccbd8c84b. 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/TCAHB2399886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51884d14f8d9085da294748e6a227267c719b385fd845492b087ee8ba131f642. 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/TCAHB2399891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b0f4de548c65c668a44418ad7be5168d7a49c9d218b37f1f8c3ab8385766b9. 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/QZ22B2082796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774951a1eb01d05a862f4a369d97c562368f075bcec63068d65112d744b0ad9a. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZ22B2082798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa614ca18594d165ff06d06a3814a14d67371ca47bfc4d8f483e5ac321f4f5b50. 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/QZ22B2082799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89d0f20b3106de46f9a358c10a504ca1ab5b5dac9f9d51ca8926c0ed0935436. 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/QZ22B2082800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1654ac7202ea5c2baa75fe17f2f3ca8210c08cdb49802ba7c2ac056c59bfe919. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZ22B2082801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bb2c508513a8d96d65bd789acf8fd8e1c723ae947b99d65275e9c11d734893. 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/QZ22B2082803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936acb1da5fcbc8f4b0686c9213c3405fd74c5eee5425ad6cebca85ebf9aa831. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZ22B2082804.