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 0x2b2ff4ad1521b69d98fc252596c5e68dc064130ad6bd8fa6b523b81f8ac620aa. 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/82b00060-cabb-4c43-8b06-c93a88a69028.json and https://artists.proofprofile.net/proofs/artist/82b00060-cabb-4c43-8b06-c93a88a69028.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 0x9108d2380dc26f8d2bb8f8d3d8b59ae2ec580bf93e728e8e6b20177bd1a01da5. 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/US7VG2215637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba96b934442d690ccd74f66b17b8e1a4e89884a5f5d619c0eef157c6c77f9f3b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZEQU2217595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9291a5e3b81b79659488bd045ff5f679840e260b5ef5ee85f73a05258e5ecb8. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZEQU2215792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a94f05e8ea2c513bcf4465d93db983ebfde6acbefa6ee273d4f288c6988b603. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZEQU2215794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30be050a69cbf079604c41f2c14730a7001bbb2b082473d7d821395dc3aa4d6d. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZEQU2223882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2178e077cf738a7e0cfdd09adbc9aea4cc0b584375bd91558e6c53488bb0f725. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/ESA112300358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc997ab816c0275b2ce02cbbc048d942cab1c740df744f8a26e38d8475e247913. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/ESA112304663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999fce21db78454cef76271fffce075e1fd86084d593483c64cfae8a62e4af93. 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/ESA112309516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b86e2b0ade060201c5134c74204b1d7f623e3e6b2549c5aec874877bf29f4c. 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/ESA112312649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b86e2b0ade060201c5134c74204b1d7f623e3e6b2549c5aec874877bf29f4c. 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/ESA112312649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0fd8ac8bb1dcb50a30ab32261fdae0ab56c4a0b601588d81c7c2f2b41786af. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/ESA112312651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe140038a31418f76185adcab687b4a76675768acded3c883352d993bcb7cb30e. 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/ESA112315483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40ce7ab88ed7c1b9aa2e935517b9d8df92f56b4efe03f005e0196d6d1cc40f4. 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/ESA112437154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cabe24839177814de7b574c23803e9bac630b692aabbe253ebd1218c4be9c89. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/ESA112437158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29689d37507ab2757f01250010adea3137580d6c028b8ae18ac7127818f7a2f3. 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/ESA112437159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a9a3d2e838321f0a1d4ea9640fd9179647a2cf150f5749baf3b70dc7d421fa. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMZ92599290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bfc6515df93ff0163c5d0e91d360fd1838582a24b78a079e5eb182b522f3d8. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZMZ92599291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd61436ce8a46bb18c4c0d880250a5b3181dc2f95d7ff3ed090fe37854c0c2b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZMZ92599292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae33250da66ad4956891dd05fcbba339f194eeee0d73fd4e6cd6c2a0969d6aa. 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/QZMZ92599293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe59fb57723f8e3de570ffb064b9987cc0ce3689b679fe9d72e11942109902f9. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZMZ92599294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21fc7b1f5045cfc92e5bf1df55ddb9a74e0201d9cc8c8fb0525181fc5dbcb3ef. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMZ92599295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da512e67a75b53b72276c2006045428b2ce6b0076ade99224e55dfbbd68bffc. 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/QZMZ92599296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81129f1759d42089d95497ac12b8f70e85bd3b70cfcec2cf19850a11c18a8f74. 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/QZMZ92599297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37e7077c5533ad8a69467990e50513585c37dfb520c02c3aaa3d4d019cc21ac. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZMZ92599298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4dddeae08b49f58eabc1e999fcad145c0a5c6893a156cb2bdc8eaf70337350f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZMZ92599299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c86b1ce6a51259ab5defe9474aae356f920b0c205c32253e68abeade795cf5. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZMZ92599300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe467b26e42d814985b007fc17bd2cb0001177428e9eb2b4e814df3d76b677662. 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/QZMZ92599301.