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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd806ff57aea1f84661e79575279848618c89d67db50ab9c3e823e9e9c0b4046d. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91cac331-3b85-47e5-a572-082c98d2044f.json and https://artists.proofprofile.net/proofs/artist/91cac331-3b85-47e5-a572-082c98d2044f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dudu Capoeira With Brazilian Percussion, Vol. II
Dudu Capoeira with Brazilian Percussion, Vol. 3
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293aabfe0dd46faa21e372bbcb20d7b9bca7e85386b1c314c577979fbaabc729. 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/ITP9L2000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464a25e2271c437c8182fda000984f9b14e3f5af82e023dd274fcafdbd74c66c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:03:01Z), 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/QM8DG2100308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa603aeb738bac04ca62871a86d5214fea25ebce0b2ed12d5cb8721d13b7166f8. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:24:02Z), 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/USX9P2445071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fb3ef0054fdea934283cb81e363d02f23be5eac0d6a1200e8ce0d570bcd4d6. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:06:21Z), 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/USX9P2451220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4eccf6d12fb8c976eaa27295a3b13764f30426418db07babb0da4726574f7d. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USCGJ2580647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605c48eede97ec95a20ddf6ae1a982ad878cc1b684b2234aeb506c49dc141dc1. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USL4Q2565268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1606396ae3fcf63561f35480df07e93bf8f97ea01796bcbe6b60133fc859044. 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/USL4Q2565273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e836ab3f87b16f95b63bee8941d244cdda728cc057f260c6fb7e40d9c1ad85a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USL4Q2575479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d52fa19634efdb61d5c1aa0c85085a534dff60d8852801295d4ce091b91429f. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USL4R2594045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16d914f1b3f5bf6eb51db958cd239b8d70a145021c0204f5e337cfced05fad7. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USX9P2500758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57db3aa4333040ed6bd0b03de5a912d3e7e7878c9079c761bc723ba893b149b. 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/USX9P2500759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9120c0be1bfa6a24ecd3f574c7b45b8dd521a2f672eb4934b83eac7cd2c610a. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/USX9P2524159.