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 0x260f901f78698e412c948f917bf4ab9697e811b5f85dd2c04a7d6489c4b3ba6c. 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/3876f94f-fe19-47a8-bb7d-d5f3e37c0ce0.json and https://artists.proofprofile.net/proofs/artist/3876f94f-fe19-47a8-bb7d-d5f3e37c0ce0.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 0x6c55dd79f8faf59eeb7a28935ee791b371d13c7394536d866f4cc58c575c07d1. 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/QZTAS2298697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2904a709afb14367f811deb6c15e5479fa54b0388dd7012026ef257485061656. 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/QZTAS2298698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558b887fc70dcd4f2282565456ebbf4667897447268f64eb048239faff1b6a2a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTAS2298699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be46d88b3bfba4331cba4ab4b1fd47fac0e0064cb6a853b9fec023c96287061. 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/QZTAS2298700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6454351f3a02fd711a37c4c633173c8b55e82c00b45aea7c903bfd9f01593f. 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/QZTAS2298701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829950e37611dde4c6e4d74ec2672bba00c1dc5be340c85a4adfef3af9b71e2f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTAS2298702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9731a52c5c0c2596d40431e7e20aa0da0a9acd005b7bb63f0f8a186879519075. 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/QZTAS2298703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab8b35eb18605b823c97688eac860ac1cb803512c10a787ea0dbee63429b7c8. 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/QZTAS2298704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de23a5b30ab65ddef57c54a9e31fe7b9cfbe0762ec53678ea37cfcb2fe4f22b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTAS2298705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7451797513052e2053c4eb3360b0f98e2718e197b182ac51630f4a76ce8eb330. 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/QZTAS2298706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8362071f742238c332d7af8f9d422f2bbd242fc5b43705bf56232b359ce9d14c. 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/QZTAS2298707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ed874cd329fd4beb087a7e7408264006d28e4818881ae6ed5a327293059135. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZTAS2298708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447b7a6d218a6f82a67d5544de4c0a295c9b6a0e7bdbce457c12618f2c494f7b. 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/QZTAS2298709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26478674fb92b0f45362968fcc9be723ef2dda57231c584d51701abec82e14fa. 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/QMFMF2450648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde498948a0552700393e614b4658cf2835e69c18f4e54f9eded3cc2eb83de2e5. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QMBZ92428130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c524a23b458c9fecc9cd2daf4fd2d1c89b9bb3036798f8a8cc8e263865cd99. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QMFME2155401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9664853bd5674ac4f3f3a20688c1b1b17b81fe34b3d89df78a7dec9cbadec03d. 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/QM6MZ2188567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357d467c0c1622e86543ba8faa355875120a82852ed1468a0f56f39c2ffba63c. 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/QM4TX2114565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c584c4dfe07aa1e1d33ae3052a69b0ac0d48a6eb798e95abc3af45b6e78d28. 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/QM6N22002569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765b5c601a1391519b8aa2c0001a25899a10efb7072435e75ded39954178b74b. 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/QMFME2017000.