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 0xa8a1d2219c9a8e966fafa380887ab02a5918e4844749bea4fd966c9b25e84ff2. 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/a273d904-5966-4ff3-b495-aa3063232dc3.json and https://artists.proofprofile.net/proofs/artist/a273d904-5966-4ff3-b495-aa3063232dc3.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 0x2657ac338b7d180543d4371add6c42b2dd489e4dded5870a9735b1133320440f. 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/USZPA0900965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bceb7683b8d2222a2b4a0f971637e3c7e927c3a0eb1e86cf0d8c6dfb610720. 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/USZPA0900966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf857f888474ccddf4a746e68e5f5833d18a3cddbc38b2cb179b6f82591c2cb56. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/USZPA0900967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9788a1dd508970de2b270bd97f1e6d8d8ef93582214c8241687c6262617e386e. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USZPA0900968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f5d63f32b4caf301122dbecfe73fc30df0e850c6bd18a3a4d39baef5cc1b0d. 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/USZPA0900969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4690c6c0c684194fa8a8a5dc833ac2497b0ff6fb26e22ba1fc8eefad15969. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/USZPA0900970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c218e6e7b373b10ecca7cc497142eb11ac5242dc2ae094598c3117229fb81cc. 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/USZPA0901409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c35133f828d88f9e7ee9e18304274ccc6a55a4953ace219e0171f35edaa44ac. 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/USZPA0901410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb291fa9ccd8655deadda2eea4f45121365bd4a79a62f9165bd412099fccfc35. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USZPA0901411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76b70d2105020e08843817319269292542c8571af951c586477fcc912bf700b. 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/USZPA0901413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6995d87e591d0a3d2ed1718b48c3b6b6b62611ffea7d7dfc766910066f8ad3c9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USZPA0901414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd08576b6c2497a441b2dcdb1b8c8f3b2416a8881da95984fffc6ca0491e72d6. 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/USZPA0901415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e55a4d901d2d7e26bf8dcb8dde741d853d1e77e117793d6950f6440d0d1b29f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USZPA0901417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3519d6dae940f24f42800ef48ea6fa755e3146a1a87797a65e1197e8e4d65073. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/USZPA0901419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77188cb0a63bfe246113eec46d2a4239674e9a05bb94d7a0f1a10c372038a553. 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/USZPA0901420.