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 0x10839346b07cb5865a9fa74c68fd1759efc82e62e3f826fd50128e043f54991e. 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/4de8cfbc-ff37-4e8d-80b3-3870d8695e4b.json and https://artists.proofprofile.net/proofs/artist/4de8cfbc-ff37-4e8d-80b3-3870d8695e4b.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 0xf46e2d26424ba09429837c6a5938cf323b874beb6cc737a09f857f45358f72d9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/UKACT1850638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf013ce1497e28fec67c3bd486b54a19f2ee485f2b2846ca8e78c69a007608be9. 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/UKACT1850640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01abe6d1e56cbda23e8a11a98ee4bafe91dd95a34798f49383f7bb0facaa1e4. 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/BEY921807018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1b3e673cf8552ecf18ca8d042c45c70325f7da4a67de8fcb7651def20fbc73. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBJX32155021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443974a8c6de5f2cd23da0081b707ea08c7f5eaef9687483fe5e89405de85c1e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GBJX32155022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd833efaa22de18776383b680c5a7ab1ef9f7fbca1d12d7b029dafb5e658f19a2. 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/GBJX32155046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f10e29ab5f168deb16c1aec12951b441edfafa2f7a298a5b0c70a75c0408dc3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/GBJX32155047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd008eb80020824634dea8e7e9c3fc5f80a5552d5ed5c71b142dab5f70eee2e89. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/GBJX32155048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96eb43054ec7b7b223d3a07fb62247f3ae733d5dda7b7c1235d8ca051aa176e. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/IL4612300112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efb5ea31ef88632b7d835c7686e530b3b0267e8e916f624d25e6de332ffff7a. 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/GBKQU2420829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69988043a92956e1b04dfe41a468960de47602bc1469857fe436159781ae158. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEGL62400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f55e6156f98cf2ce0a8506b7896881f1bbe60242c579c18d1cca7adbbcdbc4. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/DEGL62400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c3135d24138f3661a1d5104bfd669c6660f2d0f3dfebb29e3e63875f14db33. 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/DEGL62400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30fb994da6a2f2cc77e1e1fe497c798dcb2c7be65ddf94cf3825916e703c9bb. 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/QMDA62479251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe256bf10cc9423648d8a78c6c4ee8870366fcdf92389e4ff34941e652da85244. 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/DEGL62400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a09df765cdfb8863e4e62bebf3a68e04969ca60c5c31dd1578d48d85a54f13c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEGL62400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9270a7c32831653c6a039afbb6b755e527bae828e88702faee6da17e32f8a508. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/DET752500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fc20c70101fd702c71f2c6cda44c47e5b42c6808effbf261a497bb2bb85fe3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/IL1042205881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8498e7dd3c69fab171eb3c5a65f247161987e419c30f730887e919b1249c10. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QM6P42363370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870cc27ecb003f74bbcfa0d0050706b32dbbe85afa26321cf88cdc8730966615. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRX762202995.