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 0x66925cb734237fc70c2db6960fd4c6f081ec98f8b3d0f16da2077e4126dfe8cc. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17059cf0-6d1d-451c-aaaf-6ee17ee4c1f5.json and https://artists.proofprofile.net/proofs/artist/17059cf0-6d1d-451c-aaaf-6ee17ee4c1f5.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 0x936e9cf58f49b5f59c703e2e6abd841d5bf8a7d2458afe17f8eee6c333dca6cb. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZMHK2036759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54ec8e29492786cdaad26779846191dad1531b1519f4512ff26fe68178db483. 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/QZMHK2019978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e26f78b43dde623f563b72d12a34e7349e0b3c9a1b7b84a659b2e74745839d2. 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/QZMHN2096732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6529e9801391e2c51647d2264bc6cecabbbdc9317a3c0e657c5090366a5edc. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZMHN2076725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca4933bca61797fc1def5a5ec27b7bd5884fe13f8b45c57b5ceba79477612ae. 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/QZMHP2031488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663a3b2ae26b4e7c5840879283f87e60a6e34fe7afb59d01a05ca3ad1a31edc7. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QMWZB1910798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfffd7093fa3a4fec89e11b130d4d05ab6adee6b0a02d4995c57310eb07ae04b3. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZHCR2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5d4071131c590d6bbe3d45275c6a56b5dd199cf295ddfe5b21ba6569cef3e5. 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/QZHCR2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6aa803990348a30332edfc66e049978ed790c5b0831ccf6b2af45b092314ad. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZHCR2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69f569522f639f3779bd4487afd07d01f6f19850aecf1ad74195573b7da1fb3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHCR2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2156a3ad69e4b353f57016bf658a04b26aef7949464d4f0c7aeec42b7925208. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZHCR2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b6155780c18fc30dda14e721e5aaad4d36d3c441c77a6ff66694ecf9bdb769. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZHCR2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cd844e43fecd188c73d64aa2a1f44c5049bf394bead94a02b6b636af0175c2. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZHCR2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd5b894ba2de800b29b7c0a977ff830cd1b6fac422f4bdb367ec3f05ec5440f. 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/QZHCR2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95009bd0f684b4ee30d70d30ccdd8e31908d0da4825d720b1896d2897d0a5088. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZHCR2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db350b55f0f04ecfc4e3c8458768de08e45f48398a6b1bd37d9b5a2680a3f9d. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZHCR2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882e3e138e041c132ad1456a806ba7cc276b6c5c79541d2108aa4b85cdac8c03. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZHCR2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a66f6ba247c6d7797b5bef613290a889524ebe9581e596f7714ee4a4a3b05e3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHCR2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07902b9e75fb5b0875a88c0decae281c267556e13e1d041ca92fb0bc0e67983. 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/QZHCR2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bf9ec4dbe429fbe0adc63551be740dbfe3ff312e699afb8783c3637bca3bf8. 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/QZHCR2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9430802b9c3fd55d30ac49645dade47e30f6eaa897286ecc47a797178c3b8a7. 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/QZHCR2100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c0c2dec41b4a1d71e1b20bffdf28e4852e425ac3104e2233d5d95e7a054e82. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZHCR2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a33f6c93eb5fd287f38d1bf70cfa50b633c1cd439144f80e6d49d0d6550d32b. 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/QZHCR2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ede95e3a7256d05bd2b11d2d7b6fe032a1f7f0755cfcfe222b22a216db87ee2. 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/QZHCR2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd27803a24be1f2d6775552b4b2f099731e2b62e4ba65215fe7cdc6807168b85. 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/QZHCR2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234a55af3bf1475e005384d9878d42eb4c1274b723164b1f028776fdffd52410. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZHCR2100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe22255c837679f8a305a8d6ac139cc9136e8732ea9fb4dd8684d2b42054665. 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/QZMHM2050581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e14d2f8abd98c2b8bb0a058058d1a1d27c275df8ea1e645f58af03d488669f1. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBWUL2023502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73106d8129152b4803bbc7ccb27432bca470efa92d23cca31ff38332a901b4c0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBWUL1958037.