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 0x3ac22482813649bdab7d822efb03d20182453f4c09463207c60772a1c744dbdf. 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/31afe9b0-359e-4a48-8a56-4511ad77d40f.json and https://artists.proofprofile.net/proofs/artist/31afe9b0-359e-4a48-8a56-4511ad77d40f.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 0x8afec7ddbfee0468beec32cec0bd393019486ea7285270d4056cfff4f6b2e9da. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QM6P42375182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa010e5ea4fbe64b5681c5a61b64b76d681d5dfc01d1c7384b63fcb4e60cd0107. 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/QM6P42375183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68afd0c79e45fcec6838b0e2fe70e6beab94bb8c19be54ae32fc58f782077874. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM6P42375184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46fbca31ef3cedfce687b7962a83d5b9f3c305f23cac2eae6a498ff0e47079d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM6P42375185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58779c0d483cdea6d828d9dc6e08c3c476641f55424d36f686f02cf65553bfc6. 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/QM6P42375186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020d290982508fa93abdd74e250fd4b6acf079265db5b16f7b540c0137157157. 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/QM6P42375187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363ce6e6303cab9d92209865c96f276c084f8de2bf4bf3dc86b5a0108bf1de23. 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/QM6P42375188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726fd9307c64825e25feb32c9b3414ee0a1674b420747b94ff3b3aeac103021c. 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/QM6P42375189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b46494e50b65670e1164d973b1a3a93bba150684dba7db671daa5a6b9b58656. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QM6P42375190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7547e034be58f07cf4245e0e8d234ac4e0359a064c162dfbb0e0c51d7029ff81. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM6P42375191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d65e48d10b7a5284be69ef1386c86d5dbeff0c875291d13533f7c64a84e836f. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QM6P42375192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6201253979b1ad8887be7f01591bb7cc23af314fdd2d7055be83633f0339f402. 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/QM6P42375193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ab2955b4c3412041964e00bda2453b756536345e5835f25b959dde2e116beb. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QM6P42375194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6201253979b1ad8887be7f01591bb7cc23af314fdd2d7055be83633f0339f402. 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/QM6P42375193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ab2955b4c3412041964e00bda2453b756536345e5835f25b959dde2e116beb. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM6P42375194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8afec7ddbfee0468beec32cec0bd393019486ea7285270d4056cfff4f6b2e9da. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QM6P42375182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020d290982508fa93abdd74e250fd4b6acf079265db5b16f7b540c0137157157. 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/QM6P42375187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363ce6e6303cab9d92209865c96f276c084f8de2bf4bf3dc86b5a0108bf1de23. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QM6P42375188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46fbca31ef3cedfce687b7962a83d5b9f3c305f23cac2eae6a498ff0e47079d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QM6P42375185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726fd9307c64825e25feb32c9b3414ee0a1674b420747b94ff3b3aeac103021c. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QM6P42375189.