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 0xf1d387981d269a420cec2356582c25d0232b9d83085cd3641e71104c04378760. 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/f4d75993-e74b-4bce-b92c-48d953671fa6.json and https://artists.proofprofile.net/proofs/artist/f4d75993-e74b-4bce-b92c-48d953671fa6.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 0xd7c72bfabd3813afce9c1c582e280dd9c54b80300c59666603d1ca5d8561e24c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE6I31954139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb401439666dcc702e5af59806a714fb65123e2a6a997148de3b0fe7168cc03. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6I32191862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fc9f3ec0620a6bbf29605c78c0860eda8a750c3af77b42a23a377ea104b199. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/SE62M2277298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f0059e960d2cebe63978931767c721791b95985c3ff3019ca4971de4a0b4d9. 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/SE5BU2204401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7e601ecc4764e3864ca375d3319e56a8d7b113e24b749a9c6ba31044c4e7ca. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE6QE2304126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a049610de557603c3b88a017ea626f7c6be6121c2f2ed85e8eeb0f053c24a89. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/MXUM72402731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbdefc493b3f8477d10fa7f592a7df2d14d5ba6c50c5a446caba9d45d3c1e66. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXUM72403652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6fe56551ad4ad1dd9eff4953447dcba5fea76677db9e2a2b6297f33df3e261. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/MXUM72403131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a049610de557603c3b88a017ea626f7c6be6121c2f2ed85e8eeb0f053c24a89. 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/MXUM72402731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a002180d77acd4f47499a22bad2db5a35e9af8023f61c8c8d7c5245c4543583. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/MXUM72402460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f44f969fd1cd9cf2f578f599932be2f7575336a9d483f8141a5102ea3248d97. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/MXUM72403646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a049610de557603c3b88a017ea626f7c6be6121c2f2ed85e8eeb0f053c24a89. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/MXUM72402731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e688a22b23a7321c25e8b8538c0ad69112e7739bd07d31383ad4f5c035bd6dc. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/MXUM72403649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f342b309e7d4e21f0dd550e5d187cdd6b64dd1a513611f9a2c4810c3df43778. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXUM72403654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f44f969fd1cd9cf2f578f599932be2f7575336a9d483f8141a5102ea3248d97. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/MXUM72403646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a002180d77acd4f47499a22bad2db5a35e9af8023f61c8c8d7c5245c4543583. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/MXUM72402460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a049610de557603c3b88a017ea626f7c6be6121c2f2ed85e8eeb0f053c24a89. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/MXUM72402731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6fe56551ad4ad1dd9eff4953447dcba5fea76677db9e2a2b6297f33df3e261. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXUM72403131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e17ddf1968f91786d8c4356a184cc4d2366fd5da2ce2fd67a813116ef56e145. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MXUM72403647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb5a74549082fb3074271b88d2c4b906926a84031024a1456a5b053654f0aaf. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/MXUM72403648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e688a22b23a7321c25e8b8538c0ad69112e7739bd07d31383ad4f5c035bd6dc. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/MXUM72403649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb274d10deea22c110efc041f48d8a810205badddcee93274502a28e4cea264c8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXUM72403650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b64ac27683b4e72d776168e714800ee4681296663bd5a65b0cd7ac2994fa22. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/MXUM72403651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbdefc493b3f8477d10fa7f592a7df2d14d5ba6c50c5a446caba9d45d3c1e66. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXUM72403652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfdcc56e7301622491e0106b3b118e71aa7109a2ae4ac074fb1d329ebe65255. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/MXUM72403653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f342b309e7d4e21f0dd550e5d187cdd6b64dd1a513611f9a2c4810c3df43778. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/MXUM72403654.