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 0x3a5eb7497135bb86f4fdeac41e0007864015d158c39d07b6179cf4e8f80a9540. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4141847d-8d48-4f3b-93a9-08e60352b6bc.json and https://artists.proofprofile.net/proofs/artist/4141847d-8d48-4f3b-93a9-08e60352b6bc.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 0x50b231ce7d390e5555997d3112df5efc85159455595fbc59603251013815d1de. 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/TCAFP2171861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fbbbfa1fb1a0554128915317bbfab66214cd4d78cca3054d375386b632126a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFP2171878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936c0464bede7869a301eadf93b5e5e4c3e1756e16cc16bae45dee8477cdb4fc. 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/TCAFP2171881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cd50232ee072e25766451fb513cb0982c403c3a246ad27d143f812a2a63b60. 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/TCAFP2171883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437faae5a81ebf4ffcb10a7148ab27796ed8e3e922e1ec287942eb6c4eafa299. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFP2171887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930802bbcb5434f63f34b3cdba88d18bed5db361a03932aadf86d96bc9618779. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCAFP2171820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c13a18e3385efecd1bcd22ef0a3f8856d7d4f796a11e68ca7ed63268d5220d2. 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/QZHNB2439472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fd0fed5fa12aa5b64716ed8554ca2028148ce7b07a2e4905180067a71ca03a. 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/US9CY2201007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efc4ddc2f34b41d5d2c83600a5835e0e7ea9e97bd0bba457bbb2f4a140b3e19. 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/TCAGP2231256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fcd4f3735e485ba9b7ad2bf93126948f4b582a7a9a04a200970e1f89c0a2ad. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TCAGK2286057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8fcb1aa32df1241dffae74dd866fa3f15d20c2421e5222a1173802c22d55ab. 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/TCAGH2243956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9751c2b743a92f8fd0341512df37934f2e69e16c9f743e064ad7e1e71ede3bf4. 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/TCAGF2206088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798c1b8d736e038335da7f967fbc67249af35dbe1b181f0a84d6c3912be59beb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAGD2298114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b80812a5a87371088e2a18a59f55f0786116abaa2730a2d16539ee9bc534d40. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TCAFT2160207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eac90f6e4740a0c69cafb45e271902e8db6a22bab509b4b166e21ac062ef482. 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/TCAFL2120537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b65d4deacc3d8d0035bf51358a1126a711cbb3c00001eb5456650749fae350. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZNFJ2100334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502b7377600ec33f5f0780571e0b3ae4e21b26642de2b79d19e21f2007ab4685. 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/QM6DC2098100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efdb91972fd70aad74a7d87aa2299560dbba1e3a2aa39864bc153ac1d885c8b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAJB2495455.