thumb|São Paulo Cathedral in Brazil is a representative modern cathedral built in Neo-Gothic style. thumb|right|The Santa Maria del Fiore Cathedral in Florence in Italy. Its dome by Filippo Brunellesc
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 0xf4290218b8f052c41fa52ae4d14a5eb470f336788deaa1fe748bedc334047441. 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/94d3e848-e0df-4d6e-b301-c83a74076524.json and https://artists.proofprofile.net/proofs/artist/94d3e848-e0df-4d6e-b301-c83a74076524.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 0x73de5c48c4578ed2ff76c7cc34021adccfa80b6a41ad4f89367a3b73d5789aea. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/GBBPB0401854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd446f10cfbfef999976f402a3655e5db41acace736d41ab0b3a7dfef547f09f8. 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/GBBPB0401856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4c1c7bde4e54dfae76a69bfabe68550d87f66355202412bd84a5e5be4c7b81. 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/GBBPB0802307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d3068dfa3e0da3f3e0feeaa9887af9b0cbe8967cc4a22ae7f67bd7faa83191. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/GBBPB0400621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a134a8a7c2a8c5fd95a0735e1dbdc2ed471d8a0be643b7629d91cfd9414caca. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:17:39Z), 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/GBBPB0400622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dccabae080f5c7af32dd199c9b3b031028f0bab045b0e4a6d82ee3ae5dab02. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/GBBPB0400623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e14dda43206453a703ecdd39784f73bc42e63082898142a06dce88028bf572. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBBPB0400624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade3c5ac7c515c7f6648343bceb732fa5ce10930ba1fdb6450056ded0f19cee1. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T02:26:21Z), 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/GBBPB0700745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4055ead1cbdbdbf96a8079e5e922e846f5f3eae52c679c289186fca7e4b6494a. 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/GBBPB0700746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab35e4a75abbc76ee40f03bfc64c2a45e818bb1a28a8ff220bc2ab391f1a525f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GBBPB0700747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bab31d0702be4c49cd14f85d720827fd654d12615eae59d2d71a0fd01b42b6. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/GBBPB0700748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b12dcb013104ab7f8cc6ca001ebc4cc2f4c597e5ef497c44fd2f84195444723. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBBPB0700749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff99bbf195678454fd85ab4ef86f5fc0eda67e462c915552ae58b2c7639404c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/GBBPB0700750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c816fafba35b3f3d83b0404b57ae0e686530a71723eb6d3714c9fd4c3607b8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBBPB0700751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4284c9a9f896867d043f6c1e2253f4088fbfd8d94be7ba9121ac85a4f8ca05. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/GBBPB0401813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81af9a7bcaddb1328f68a1028b69de6328f8eb74553656b918c1e8afb3df962e. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/GBBPB0401814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfe3e5cb25c1fa2e1eaf764438e066728fd86c18a0590124d22ca05299f57e5. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/GBBPB0401001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb355ef67df0f51d92f9b2dac5624ee68f7461fda677cf2d91d33fca5925d9f7d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBBPB0701200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f0d34ae253d42341976209da578c87a549c9cfd41c2889cb6c20349ef35665. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GBBPB0401885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc932723ce620f076f06b17daffc7c1c7d44dba0e6a77fe2292f5c2f07a1afb2f. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/GBBPB0401886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd166c37a5239fda8448202ca2934974d2bf6db48d88f06668616786944b9bcce. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/GBBPB0401887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a5c8094f1861baa217b4b4b3b0b943f1d028c61f0ddfba819d0232eccfe95d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBBPB0401891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536bbfcc2513a3e913be2210ed19b543f89c2af25aca3e827ca04cc70feb5f79. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/GBBPB0400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e58d7bf79df8d404bb6d3b3b6284b21342f1739c70b58610f9256d037ce0fb. 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/GBBPB0400088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620a746dec91adad2f68411c378afafa4b30b761993601c4cf541ec1c52e86e5. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/GBBPB0400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c45f5ad7a1edc25ff561a0a9c0f326937f95cabb74bf2aa47281a0164b614e0. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:12:50Z), 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/DED830585705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb404bcc140b327b509e20986d2cdb5ff812f3a8d525751911e5f818b1c92205e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DED831000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27df5db0c1dc0403e5a88507e5f6d845358f61d98f291503c4268046722f66e. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:37:36Z), 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/TCABW1493376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe973ba8bf07e3cb2e2e6f02ae9f0acbbab828f3280d18e301099e6afc54c0819. 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/GBBPB2102614.