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 0xf475e9c924d6b7887a3002986b63f72189e517c20c03cd7428f876c075c1dd97. 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/22a2b3f2-9e8f-4ecf-bdda-37eb1c0fb8dd.json and https://artists.proofprofile.net/proofs/artist/22a2b3f2-9e8f-4ecf-bdda-37eb1c0fb8dd.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 0x9f9acc3e3972fdcfaea8b55b5bbd1902723f939a967f6468af64399a7999a158. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QM7281881073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4805e1276123793593cbe4f970be97d472dbbb0780a9b45dbac68f0f313db59. 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/QM4TW1913000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd921b58855bed1c44a71323e91d7b9214386b4dbec6a4385205d9bb8ca5ebef1. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QM4TW1913004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450dcb6579aefb50796e2669f923edd1fd04cdff2eea1b821f717ef8657d52f2. 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/DEPI82312906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0de81d28e3542477440c3671ee39187d104130560eee2be04f099985cd676dc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEPI82319446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de497c8cb6b1ac24b8cab3347a8f037a97f36638f879bd04c2478c72f0d0262. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEPI82433488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a975e05bfecbdfdd835b55e94c3fe5937c7535f325ce1439322e67ab5db197d. 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/DEPI82500881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a975e05bfecbdfdd835b55e94c3fe5937c7535f325ce1439322e67ab5db197d. 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/DEPI82500881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93d8d38599bf11adce69bf2c2107da7594fbd737639d2aa63cf557dc192d1f7. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/DEPI82310761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717e7d410ee918db40fdd7dcc0f4f3fc5a40a8a47c6d7984000112821f939147. 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/DEPI82512799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540dd6dac5cb78722f436c19b255c972f460f14306d0b936fdaaee14486b0141. 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/DEPI82512821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a975e05bfecbdfdd835b55e94c3fe5937c7535f325ce1439322e67ab5db197d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEPI82500881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38ae431dcd2e7c65cb9d52b0fc0974f615cea417296be2a1744db042f88cc0f. 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/DEPI82508867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214e2459a39fe6e54db116cbe4ce9868e5377a73c9eedb2c440011c0d2a1097a. 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/DEPI82504272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c833123b40dc05978b34687272ffc238e751c9ffb4192f1b915e91d99f6394b. 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/DEPI82512823.