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 0x78ae27f032e28cdd815c0f2b7cbe3afe2428b5bb5bb048882030d5f66d021201. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cbf1dcc-65d9-4826-ba7f-22f85bcbc1f7.json and https://artists.proofprofile.net/proofs/artist/0cbf1dcc-65d9-4826-ba7f-22f85bcbc1f7.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 0xdd6fce6ef047107df36bad76aff60d519625d75e84c40b777b45b237e8321e98. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEQ121642533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48124b7b6041ef89d14dc1a9a27ed9664a0ed5053e5d61fd20934506c2b7c0f1. 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/DEQ121642534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae7ee32804f467c3f618a5acf5230721661f7754f97033ed131f9f74acb37cd. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEQ121642541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa621339bc484827364d234eef32feac57fcd9fb87922031a8c6fa73f3582f89. 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/QZFZ22369833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410a4a6d5bbc849f0b0f2f210f41827412bd37a0c916d7645367e7e854d10b2b. 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/QZFZ72333496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf213554c5ac239f8c575ae8f104bc53e8880393e7e9e5b5b745d35f55ce373. 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/QZFZ72333497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f56f8b6871931fc9e1dac484e8bff4f23578a930959152a93bed0e7f00b886. 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/QZFZ22369829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419cfef131a0ea51a9921e2ced100712861bf901c06d4345373a54286f9f74fb. 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/QZFZ72333498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00661a105228a0f6514f254fcf613ae629112816def6ba36c836449c705c8003. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZFZ72333499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebf171307bee444bb775a5c6875cf757072787ac3b4b7bc3c9f85c1af0bf777. 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/QZFZ72333501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4227ab63345cce99cb845ad2a5273612b8bf475f5ad27f5cf33523f77c2f6d97. 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/FRX282446603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd724213938fc555dd0802d9587306f443c2b487044c90693d6f9016f3d23d0f7. 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/DEQZ32000649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262e0180b79cf38f8b11c9c06f33b2bcf0fb8ea72ba5bc4094f4712c7105e6bb. 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/DEQZ32000654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cc75916599859a31387ea1611a9f08fb0497a9bd4af14e728cbb8c1b89a447. 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/DEQZ31900605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8507a714029a5cc2c210a165cec51aa34d61e462b0e3acf30d3672b181023998. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEQ021902145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e00ec90855a5ca26dae2c916f835a09399643d098318f452750bfca5aaf1b5. 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/DEQ022390231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656c3a29ea1d7ab05cec7a65aad36cd4ad6fe566bdcb68501a2c67e64530d2da. 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/DELJ81623049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4bc6aca45a0816ec13cc76c9fdf826056945eabe42d45742dc385dc56a4d86. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DETH11600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd724213938fc555dd0802d9587306f443c2b487044c90693d6f9016f3d23d0f7. 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/DEQZ32000649.