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 0x43f23208836913dc65d8366787b7bbeb1a1340b7fda5bdf04d7f31addefe6ea5. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0324d46-5b3e-4ea8-a1e9-b1aa86ea534b.json and https://artists.proofprofile.net/proofs/artist/d0324d46-5b3e-4ea8-a1e9-b1aa86ea534b.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 0x5e3356ec5b008255d97aae95180a03cb39e70bb6291980a1d8b8585a3d54d6c4. 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/SEVGD9802005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa888103c243c44c316b48613c246b1844dad38538550e5e563c01ab439e8e6f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/SEVGD9802008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9541eda8ab9e4c0482c17688cd39afe121224269ad6093f5a57092bb596243. 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/SEVGD9802006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e67eb45884734b2b4b3f2547fe5cbe0e6f0e9b85ec0a8527a6facc6766b3c2a. 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/SEVGD9802001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ce426c69664596600f94936c96af70d7f1ca4c88809ad87c0b6442020f5961. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEVGD9802002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa888103c243c44c316b48613c246b1844dad38538550e5e563c01ab439e8e6f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SEVGD9802008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38433c9984d9234465fbd45e21ac44344b1a5240bdd8b0f8291be584c1898a51. 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/SEVGD9802010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeddb4236357775de3155fd4cdeaa4ce17cf194920a50faa0e35a567f03936c54. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SEVGD9802013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1c8604f8176dc23b04c75c90d894f1d66c35673cbedd452ed1b51a77a17dd7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEVGD9802021.
Du Gamla Du Fria (Sveriges Nationalsång)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34621afa76101205bfcd225bb3a9eadf0b3c0429cb48414dc727ee0876d30997. 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/SEVGD9600601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bec752e1753b764eaa33030b831bed588092c67a75932af82c4466bd633e29. 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/SEVGD9801016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bec752e1753b764eaa33030b831bed588092c67a75932af82c4466bd633e29. 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/SEVGD9801016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe724404120abddf331020456f2aa82d50e7c058cc934ef53587aaea383555f3b. 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/SEVGD9900410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d436be99779d91619b77476453b33132c950539cf9c5150bfa20bbaf0a1f0c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEVGD9900413.