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 0x01ca8333a98ccaa6769cb8544561250b970dd5e78c250253a01f7f5b2eaef1e8. 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/5b85f790-eaff-4b39-85e8-b2195d6465cd.json and https://artists.proofprofile.net/proofs/artist/5b85f790-eaff-4b39-85e8-b2195d6465cd.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 0x7e37af3435c02ecd127b11e929a1c344ed1169b216f77dc2f50f35c287881a74. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAHD2395088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3cd19597847c846325989b3ce06a3822caa354df8fa1479585ee43a99b68c41. 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/TCAHD2395096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a18e60978d676f9add42b3a5863f149c80659799c1b8a538138a917428f0c9. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/TCAHD2395151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf972dca652d36bd65c5a3a9fa4dca64b993016c5c0f1c025565f98ec3dc0da55. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAHD2395162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32d1a4787be13c34c8396c244df84d08c64f8e5f3e28fbf8f1ddc1b66703b1b. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/TCAHD2395169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fd43727a225d66d8144cfdb57077dab21c842e50ae1fe832b0c488fd5684e8. 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/TCAHD2395172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035ac598e86cced5e96c47e2d66b4f7955ae4e01f289a03d750ee967cd53dd3f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCAHD2395199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaf1533522d3d2c10cde2de253b9075bf6bfb4fc4afa290f7119c592a6902fd. 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/TCAHD2395209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68853fab15b2e805f9e91127d04b24e1bd64d00d3db109a6d8c9294602da7d84. 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/TCAHD2395221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e244f5f30609a7b6dc9cd03af1a2db5a317b6835fd4d898342237c54bfcb058. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/TCAHD2395228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2850c917d0320b5461ce5d01bc50f74f7368a307bd9cf36b16fc757f3d75f4f2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAHD2395249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4105ad60f210957fdab1ce02295e5b9f8120717db8c344ee6e450e3a3ca7b8a. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCAHG2378045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ccea0a28613528ec4c2e4c76f0330425aaf89ae6ee3fbc76eff1001f43c36c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHG2378068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3423a8840b7bcfe7ad0860fc6e0645b93f1f818fd4acb3bee7b1566a76c6519a. 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/TCAHG2378003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383bcd53da56851e583f6cdfdd45645f23db64c27327d9b2bb6698372ef65e5f. 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/TCAHG2378124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ec513ea05c6d76ac59912244c1e489a6532b122a8975fe8746a878bfac793e. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCAHG2378126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892a7be9573c042f88fc33faf82e3819aedbc383936540fe47efba5b6663d994. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCAHG2378130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845a97f9f15ab49f80d4e77dcd55fad313c91e0613038db8d9ddbe57e96ddea5. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/TCAHG2378135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc019794097de205414e9ffb3c2025d90158efdf10bc353c7168c49dc855da75b. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHG2378141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf95e8ec06497fe09f004a8b981b26c98c82ba21ef8b430313c4061de0544dc7. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCAHG2378148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae14221051282b93ac477f385a0d0570dffce79172370f1b5c235a137d5dd6a. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/TCAHG2378154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b253312ab86760652d04869e6d1a4c0548f3c6266a7615c0a64409c44bde42c. 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/TCAHG2378163.