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 0x549a589d889f90ff630a345902221de11d987c971a2ea60822e4bd2fa7e6f97b. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d8c8e99-2eb1-4740-b594-7e008626089c.json and https://artists.proofprofile.net/proofs/artist/4d8c8e99-2eb1-4740-b594-7e008626089c.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 0x543a7f53111db5eb35caf4b8ba800d1b5f03dbc8d54b6de5cac5649f2ddeb098. 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/QZFYY2471010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0284bfdc279936edc9660eca243a9e22a031af99dcef7d04cf7badbe7aee9477. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDA82444498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e5e41bcbc72dbf8e058c1801dacd9623516b4bfda2f6e2b186d7ffc0f1f288. 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/QZNWS2474022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80b17badfefa4bb4c615117e34bd02ad24438b401f8022bb234c8eb8c9435e7. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZNWS2474025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb828d32b95d1bb7a2f36fcb3f0c8051b53deb1156a028b9f298730195467f2f. 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/USLD91765098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba5efad0e3dea4b2e4260ced3bbbeef5b9ca3598ebf9974077d0572b03326f3. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USLD91765099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7393df16956bbd6a1455b64afde4539a65889b2b1700f5dd7e0e8917b4aabb9c. 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/USLD91765100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e699a4909c83907b3f4c96bb7db2b9c0d5b010fa08c23abec691065c68adbfa. 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/USLD91765101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a338485cf7143305bc86628586580f662900139198c43c165c7d1af8c3a96d. 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/USLD91768151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b5995a7f638b9cab67f4b3cfceb05a3ab2ca5c3877089c9f33650ecb5bf1c9. 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/USLD91768152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa203b942374c54f9c7182517173d391b3944020696f870c7fadfe375d78272cd. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USLD91768153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736ccf0b7dada1f4c3b776c73c559208eb78cfa8e068cd61fcf1c36a7122f7b8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USLD91768154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8266846689e5b2a075f2d5f83a54c568af3e7e6a8e635636e628f4c2155aa61d. 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/USLD91768155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0259ca1b8c3e4c3a3d4d20cc1136b596eb44d7d1cff4e62704d224946dd484. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/USLD91768156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06600d3a78a0defa7ca910c21d535e389bd612e560f4607631891bf23d632da2. 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/USLD91768157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a43ecc70a95f5e88bb7cb70d79cc22ebe9d19e41b0d303b454091bef94ae1cb. 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/USLD91768158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2effaad55aa88532f2c1b02f8e9c4b4273e63bab44e299c59ba729116b7d71. 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/USLD91768159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e6612bb13aaf48fc1ccb4526c45e607eb0c88831a6035155b0ecefa6da2de7. 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/USLD91768160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495e77f7e5f89786e9b754d1abb45b9d70690b0795d1e402ae226f3fd9237e0b. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USLD91771830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cfbd741226e4144dc9a7d9e16461c63520a5893fabd807a0aa73c6b85dc9eb. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USLD91774178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec542ab14f4e761ef8eae7b6ff9907fccaf8812bccbb907ef8b3fc23bd934316. 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/USLD91774179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d99dc97ffef7f79b654fb734f046ddb8df2a04f64ee57eb9439014b6866795f. 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/USLD91774185.