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 0x402827acf2f1d70b4cfdcf7c2cff9c0d71de70a19eadc0f043dbce95303f1934. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b6bda78-6920-4e36-9415-e844160afacb.json and https://artists.proofprofile.net/proofs/artist/6b6bda78-6920-4e36-9415-e844160afacb.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 0x3aee53fc6f7bd8ed1adc3b4690a4f53d431076969ce21d39be549050771dfd69. 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/USHM81046376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11075198102c2193e82e873e46c04d3c3d01428cc65353a93c667cbd9eac83cc. 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/USHM81046378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0cf2a7fd66f89731b402e40eaedb9bc0bf10c2f4adb55ae7c7342b755a06fa. 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/USHM81046379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd972fdaadb50441ce9876261c09e3e2606b1f0d41d4a281e73d1e7bb501e42ba. 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/USHM81046380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d35b1bf1cdb428da708225d60e62b38b8ae8829ece1ce8047984edc64666db. 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/USHM81046381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16090419cb8ccce86cb1e3dcc7a0a604bafb7c802aa9417fe72e7e4028aac773. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:26:47Z), 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/USHM81046382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82463a9b7196f1191e659e0456bb10cb0455eca6496fb2fbbac1e2efd9fb5a70. 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/USHM81046389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3e416382e8f1481c0c3793de21ad3bbac64a494af663b37ed1c621a978f538. 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/USHM81046391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07433dd8d605f5bf1745136413b88e91c76a5efe7a1f1fa1bbc3745d1f1e328. 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/USHM81046393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1ae14ee75eddfc3d5417bd77c72d3dc9a044bb8ef3eebfb12a02a3098f5e19. 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/USHM81046394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502297bd2e3dfa72b5b4595f7acc2daceb2c11c625147b6aefde68736fe97615. 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/USHM21076584.
Putumayo Kids Presents American Playground
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f83442fe21f17d04326436fe3fbcefc68b0229556113a3bc5b0cf69f369f80. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:08:20Z), 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/US39H1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3198a6fe8f0987cc08b7e30a62cabe5ff52a8fb002f9bcc1992d1bf35d2a49. 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/USRHR0417515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764117302a1b955cf32f5beecb52396948e2ab9cbc029a495eacd7e8ff33a78a. 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/USSF11006405.