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 0x5ccd6f8561d4759246f2fe54e6cdcd7b973c77889c7d4754e70d652210231d27. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21fc99c2-c4ec-463e-9bd6-4037afb153ef.json and https://artists.proofprofile.net/proofs/artist/21fc99c2-c4ec-463e-9bd6-4037afb153ef.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 0x48370102a29814ac9bcfd9c7e4447974ef1f2b449e7f2c1d4af46a9f475adfde. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FIFMF6100065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1765a1e742c2e74f6758eb3dcd9759e33f205224439da61944ef4e8094861717. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/FIFMF6100066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fdf2c74bfff7f2468852c13dedaf4b7bcf2d90c9375f2f1d189bd66412c56e. 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/FIFMF6100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba821bb611255efab1563703f3cb86243bc2751514d70cc8860e567096701139. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/FIFMF6101200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2075b1b5506c219d28960af1c502c2799dde44e2cddbde1d157d86d43da99537. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FIFMF6600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d27f2b3a15cf239c1e9ae06781b2b3f9c1798b49740bb72f1cd85f0ac33907a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/FIFMF1230943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a49354420d8f36dc95d8675ccfc11a82ca0c9f3748e2491d8ad20346ec56cc. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/FIFMF1229692.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053fd704fbce98efa3d2125fb5529dee7ac1b30dde6cda5cbdfc9e46e9406dee. 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/FIFMF6100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48440e452239926b70f3283edbe956424f233946b65a4148629d4996e24ebd7. 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/FIFMF6600900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053fd704fbce98efa3d2125fb5529dee7ac1b30dde6cda5cbdfc9e46e9406dee. 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/FIFMF6100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053fd704fbce98efa3d2125fb5529dee7ac1b30dde6cda5cbdfc9e46e9406dee. 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/FIFMF6100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc139c9b515cf904f84b29741ae8123f79cc59c4f6cb9044d13033ac1b67b67ba. 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/FIFMF6100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca272ce132b306f9b12c423c0710f0097a3cd430dc8608d3cb24b90cbdd992cb. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/FIFMF6100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48440e452239926b70f3283edbe956424f233946b65a4148629d4996e24ebd7. 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/FIFMF6600900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d4db8894f249033d969035c854f0460ca4b81f3346d0478bb98d4e8b37b76f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FIFMF6101300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2075b1b5506c219d28960af1c502c2799dde44e2cddbde1d157d86d43da99537. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FIFMF6600002.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca272ce132b306f9b12c423c0710f0097a3cd430dc8608d3cb24b90cbdd992cb. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FIFMF6100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2075b1b5506c219d28960af1c502c2799dde44e2cddbde1d157d86d43da99537. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/FIFMF6600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c45f68c2545b2b2276dd594d5331ba91070dd57b50e020bbaa16cd310c022b. 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/FIFMF1227023.