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 0xf5300e88c72b07519a60606ef9cd72da0663a1e9caaf50234f978ecaaa28a6ea. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/556fcda0-c718-46ad-b32c-f14433f6e18e.json and https://artists.proofprofile.net/proofs/artist/556fcda0-c718-46ad-b32c-f14433f6e18e.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 0x026c8f2e76ffd9a250b12e34666775c1b581d90e3f459bbf8a9cf2b407bb0b5a. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/GBRKQ2576555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c3921d470edb5829366d88620126d5aab880f31ae80a5a3c793126550e8288. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/GBRKQ2576566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e8a2cbed74dcaa449ef3c9f5817e6d4e6a870e8b68dc3d7d43f397884845b65. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/GBRKQ2576575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82733dc2d247d84e96ec80d65d1345c05567a00de0ca3b1eae403f7c3757612f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBRKQ2576589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f1ff35d6e9362e0d1ea4b623fb89b0d922659262f7594693128c0613970a89. 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/GBRKQ2576596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a14d1402475150348a0cdb5d5aea57691efb618a7688fcafbd543ab6f16c9a. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/GBRKQ2576602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135a081af3ac9c3c6453ef7d3189c08dbedc580f4f3e862050c852f133396ebc. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/GBRKQ2576608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0f844dd69ac958269e22c365e81fba1a4b4c45521cdba76a6f52ff7882dea6. 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/GBRKQ2576613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630fd694ad69b4913bdfa43f019b78971130e8c8c0b130e621956ff4decf5e92. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBRKQ2576616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb366fbce4fd6d2a3d136223fc7b657cbb2b3b74db399f59ca066d3e54ed45470. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/GBRKQ2576619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5173ae43044fadc84be554ea1d94d3c5bdf73867e7fb4eaa9710d0e83f5da20. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/GBRKQ2576622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9064bb67264a2db83fc8055e264e3f14ca96c6bfcd4990cc247671a12395a88. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GBRKQ2576626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8453580e88fed1ea9e9015d4017e7e3a4db88f5ce61ac92e728044af4cebd813. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/GBRKQ2576628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe958eb1a72edc67a54febb04e34a1855b34c66ea69ece562ac96e0d44c15a2da. 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/GBRKQ2576633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe418e6b719521ce4dd8f1e4165bdedc40a83eb175797ac171037cf9087d6ec18. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBRKQ2576635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe774adc13ccf3835600e7de275d6f2b1713637ede346ea4ac65a8fb176011937. 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/GBRKQ2576638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946b55ceb817977c6c936c726ade1e2a411b6fa90f77e9606ead3191e9ec8259. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/GBRKQ2576642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f604d041d353ae43d203a0c93383cffa94dff0f431e7bf4ec8aadb1df332e62. 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/GBRKQ2576643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9cf53f5c192acc4662834c34612231c09d02500eedc74b1cc33abff9e04ac8. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/GBRKQ2576645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc822d57f8e179f0ff4ce57dcf316f81c988679e5a71d04e3566fa2a6bd3ce2e6. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/GBRKQ2576646.