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 0xd5cd2f8340c676f13aa26c637227a1ecea40a475182773975d8fe7febdf9cfa2. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eda6bd80-d98f-4001-a89c-57c83a06e78c.json and https://artists.proofprofile.net/proofs/artist/eda6bd80-d98f-4001-a89c-57c83a06e78c.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 0x9222486ccf9a33791e117e278d80a50309954807e63ee66553be792f0c90fd7a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QM7282400564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b90fbb04f394bd53629392cb1098b776d1d37c13a205e42caa29d20dd18039. 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/QM7282400565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159fed539aff976eff3d2e92a4bdbf184aa04ec306e0b8959a7be9b93266e012. 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/QM7282400566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319dd5e08756c5792874d4db871367e8d0c65e3f992f737f9ec8bbd9c630ecb5. 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/QM7282400567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559df5de35ce079e55642dabfbc7f3da6f03f64041e88a3f03ac379af889ee40. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM7282400568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3479c0f3239cd6968d0ef3d48730c64eb2835acba3d05f5a06faf6309acdfd. 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/QM7282400569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a31d7d062e4a6080b4247ddeaa702e31cb00fa0a6206e52ccc1c9f4912d70f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QM7282400570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8afb6948032b36ef4c9bfc8ff482e9588c92e42bf4058bf10e194f5428660fd. 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/QM7282400571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae5f031367664298e6a7f841fcd542c5771325bb5745da8033fb225052dc255. 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/QM7282400572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc336bc5891bfed04e43633a00e03b3012e526740e455af33b764ad7096cc1dc2. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DKPW71700201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c20a1e6becbf27c9ffb3d0d62aaac969eb3db53fe2d1181414ed2dfd590a8a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DKPW71700202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77b05e970f07e213aba9bf52496c84983b06c1906b99e8790b32a082cd0b742. 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/DKPW71700203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7af2ee29d492ca7c47c44d6641921bfdcb6aebc3dc11ef9d68d50804762d06. 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/DKPW71700204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc833dba71f592f58094cc4a0906c9291cb5a2354d260517bb8dd3fec27d8eea7. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DKPW71700206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf5eec3801d4f6b820d9514d949beaf1abc186a45ef026b1f4efae11ab82041. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DKPW71700208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb290bd50fc349b958318796837745bed385d33be5b75ce2c4499fb8ebf9ebb3c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DKPW71700209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b8275186ff0787def3944fbe87ba2bcaefd0408bd508808039c75969e06a6b. 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/DKPW71700210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b74dc217425e66e6299e8e708c8024313f8fa645e4f5a7bad05e1134b69d08. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMBZ92309748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18ff2ed2a1ea4164204d337e3139d516170d33690d64c3daae141262a23892e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QMBZ92309749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d1f37cf1c3bd25983da47ecd98ec701f69fa25a3998b3c804a367b3acba4a4. 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/QMBZ92309684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0448cc9e83d9b0e609413f424ac6a7fae729abee7b9619394d8f88f617117e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QMBZ92309692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2fb855e83e9e448dd9156853341b94880f5bf43d728f26f63f40b0ef7b4543. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DKFM21700110.