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 0xf3785e7121f4693b8eefcbce56d86b1eaf8dbc498971f4f7bc4ad326e84c366c. 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/188ddf17-bfeb-4474-8ac8-7dd2dfaf49b6.json and https://artists.proofprofile.net/proofs/artist/188ddf17-bfeb-4474-8ac8-7dd2dfaf49b6.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 0x32e1b4a51d04afe74ea0a216bffe15ff0c71a59a8e158a45557dc3ac67512b59. 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/QZTB52256808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0013bcb19db6b846fe67f5005c8a0a2d468da3304f060be4ad90b88e3d7148ca. 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/HKC492400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302f9c1944b3cdf402b8bfcfc1eecf233e0b6e6461e720a5edcd1d773db9298d. 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/HKH612100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71d191fd67052cc2c36fb7e491cec306e07881d26f74c52299a10ebdd120e34. 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/TCAHY2477982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8857366581f62774c6f63c6e10e756b34411164830007420218babf872237ea. 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/TCAHY2478031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aecba55121f8b6cb608283b1a984c4a9e09689621ef39c25366feb9f4258b4d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKJ962400451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6605fdf2b1a76ff42b348577fbeb6f7f985d0952861aa6593b5eb5d3974b7bb2. 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/DGA0L2419269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae82c4f97008c3c8693ef8e80811b8639fe595c426040b1df44024089bc4a804. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKJ962417003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc520fd8f9218813178d74a4d7d945635b9f3d7fcb1bcf2a98eb5a8d0e1dd400f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKJ962417001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05e6ede69580b6cb81a990849ab3a7207401e081ea0b8c960f05691c98f3429. 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/HKJ962317006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb6bc56a0e250da87afb0e43167deae97de163859f3f48932d8698cc842ff37. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKJ962317004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed99a822548e4ee29888d16fce8617477b40179e320bb79b09d04736beeb59f1. 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/HKJ962317003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d92970c3ba422ed8ea9df27dca81ecd04e7fa1913c0a36621b43737fd59575d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKJ962317002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cacb15d796e9e0b6e4fe9346c231cd81d0eee0859479b71ffc2cd0f6b9e2509. 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/HKJ962317001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe44085d42bedfc33616daf12fdf97122dfb1bb82bcbd1f014783439a010af8b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKJ962217004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27ef9099f63571d14e08ece5258f0e672c069f01673107c408e26f7219d9a88. 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/HKJ962217002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c7a77ff7e82e358ac98f1ecb576d163f62da44526e53716277d28f38bade1f. 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/HKJ962217001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab6e3b86a3c1a7cdb4664756e590357705203a139a28ee3f87dc46876b29bd4. 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/HKA412100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ff60d6834d952fd979575acd46283f650c32feea52e1e1f740fd1331da4ba4. 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/HKJ962117001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fdd4ba1355d9ca34fc4531b757c13d2c78d5da786a94359db424f96a4523b9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKE952064704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ec21e105e0197930ede4127aab0e2f2b605587a33be9a2479ee9fbf7439256. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG482010444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c27aeee0e23998421e95718aa2f093375d68da1d83a8ee6ea953d62a7a088c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKG482010429.