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 0xcddc797a57c627b920a06b546b0dc097c9a7197119f0936c88e070d15079c4a9. 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/df6b78ef-2703-41b9-8f6f-df7fe539a24d.json and https://artists.proofprofile.net/proofs/artist/df6b78ef-2703-41b9-8f6f-df7fe539a24d.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 0xf94464c2eed72ef128e3750c31d5c3f6cd15ed9b3fd126123cc4ed1fb5f7a820. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/TCABR1345662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024e9a1e262e35f324babbccd4a82cfd57fb44280469eb980f8ccd60851a4a0c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCABR1345663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00167676bf5d5b3cbe028b2b48baedc859513c1269d1194cb5acb157bbad32f. 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/CA3CM1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90df3ed60a03e1d7e2b82b9e085c8e6de305a09418c56cf99d53d9e1d6268cbf. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CA3CM1500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b10cbdf21ac71fcc70f388a0c24997e931329cb9848fbf47904c13d1e1d5986. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CA3CM1500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae69513ba45af42436e97af36e5583c43488b6f0c2dd15c65ec0ce703d589484. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLRD51509365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd80e41447c108b74528682c8caecf44f79cb019b05f7cbe1120571ea444138. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/CAK471601201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf8fd429025d50321b7b9471ed74cf9f7fc09547b1d69e64262a524ef41db08. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/CAK471601204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356d86bc0e0d1e15ac84414a5c37adf688f6e115189d1a7f1eaa4c75030b32cf. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/CAK471601206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1179ec5e9e70aa8a02287462fc86071bd8862f13e33f9bf8f7e804bb61b33b25. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CAK471601208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631b8cb41321101af8400e119ae7736e52e8e84cea52fef249f3dc4a042c3b79. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CAK471601210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6f02961a6d2c402890d86050d99a69d4496fb3ab35009d044a39eeb27ea79b. 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/CAK471601211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb190f0f426f759ec10155ce1a5b12b2110db3af71eb314fd50bcfccd00cf2570. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CAK471601212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06217d35c8c0aa7d58807a24433c06b78606aad854e8a9385defb8018ccc8b16. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/CA3CM1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d4d6b23f602f1537c2acce252826dd42a9aec69f9f8ee2c9e95a22dd82c4f2. Chain 2 (Bitcoin): anchored in block 957665 (2026-07-12T06:13:49Z), 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/CA3CM2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2626e37e5053d3589a03ac83f395ff3524b0ed52cbea193dd7fb77de91794762. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/CA3CM2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0217373b8bdeef9632ffd980bef6a32f7f56697af0dfc63dcc0910a8b698d41. 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/CA3CM2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dac1b5e4316c3d652d2d09ee2db658cb8cffa1115ce7d8b93971c48da3a1d5. 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/CA1C71900036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dac1b5e4316c3d652d2d09ee2db658cb8cffa1115ce7d8b93971c48da3a1d5. 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/CA1C71900036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5cfe40068901bf61c504961f7b358e3220bbd62c9743d2123f04dd0a3406af. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBBKS1600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca95092f60c882f890dc01043199bdbd3138dfcde1db223370589cb7b6a996f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBBKS1600024.