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 0xdd2375db8a1e910d389f1f9ff6dc7d8f125c4bea43544e3be3f54ae5008218dc. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6691b25a-5583-4aaa-9a4d-6ebb6536a7c2.json and https://artists.proofprofile.net/proofs/artist/6691b25a-5583-4aaa-9a4d-6ebb6536a7c2.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 0xce09845d589de4871043c197bb029c632671b49c51b89088de542614ac75ebe5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SKB841300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21beb3078101a7c2592877059311d4cb60addab6baba6619158c516a6b225c8f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SKB841401201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2098012bd7fa380664165806663abdf066b36ccf74f35de15df28adffb652bba. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/SKB841401202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1feea85d0647a22ed22f8952224950462a6dba765b4a9b7917d19c5973abddc. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/SKB841401204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701093996cd4b0629b8f5dff4b1f728078ceba64de9c126ba7f3bb527b4ae680. 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/SKB841401205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd872d4c148e9c291c20b4630bb3056722082b2a98ef3dad55fe45036c38caa5e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SKB841401206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f19f8322f44ee45a2a6088ded3493b3e73b2b13e3226ba1ba6c15630cbb5402. 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/SKB841401207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc7e9d5cba2545df39928f16e8ed93fa8f59003eb1a79db4501e2c70c5977da. 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/SKB841401208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdc0561f7944a05e9e89628003dce5383f61258215fb4764863f124e660d2ef. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SKB841401210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7011c01419707bacde6da47dc739f1ec0686bc1f434e1ce0d3f35b1d190c294b. 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/SKB841401211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b426ad079ab66d157d7dab2a61d4af52e3ddd8ccf0e072029775addba60f6c8. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/SKB841401212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a394db10d39f8ed654e631246b95afa10e8d1588071d8ab8e496dd7fe16483. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SKB841401213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe397ae069b40ebc4ecc45f42938ef41158cea644653f59b1e81243909994c4b0. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/SKB841401214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca15c9cd9208fcda8ea9f01f13834271de7e214122add52d6c724f799453cdf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SKB841401215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7564049b8e63503e83b7b7f6f0971ffaedc324789d937cb02b590933a7e53f81. 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/QZYFZ2342008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713e958ed49ee26ab4a8f4a952725ee01f731ce20c7268a7b97fe0efe5dd9707. 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/SKB841401420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04fcc5dd9c26011a7cc5c35f3f743fe59415af5e60d5fae9df07c24ff1bae63. 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/SKB841401440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ef1f201e9766c9ce1d0d880cc4ed4eecff58c6652008e14ff23110c188aba9. 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/SKB841501606.