thumb|A McIntosh stereo audio amplifier with output power of 50 watts per channel used in home component audio systems in the 1970s.HiFi-Wiki webpage with facsimile of data sheet thumb|Amplification
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 0xc12dade6eefc90b8678577f4cbb26c4cb1546cf45b06374f615df53c874f72aa. 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/5447c326-e079-47d7-87e1-a5011e2583ec.json and https://artists.proofprofile.net/proofs/artist/5447c326-e079-47d7-87e1-a5011e2583ec.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bf77539eb33aac2188f83bff8a6d9e497daeef0fbfbc5b031c38a6d5f9a8f3. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GB7MC1600202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb925b1b3640669848a1dc18a6f8f5242c4ca131a42e09e08d06f0be05f5cb1. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:26:04Z), 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/GB7MC1600203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1be5ff425f71c6531060f5f47178c61efba0cdab436d707d6928cc308e6a4b0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/GB7MC1600204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b7d25ae8c160948801363a7bb810c6dbb2b7517641c051973301fa225b291f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GB7MC1600205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f12d6c016e63eb07022699ccec24b008f29199e58efd9256885b761b0b65f6a. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GB7MC1600206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b64a2e5566881d1ab1ae0540c854186c3d6ed5b45c98878b7ac52cdb4818ae7. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/GB7MC1600207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808d1767fed57e042c2e16ef81a4187354ffdf74344c70aabfef3602e76b1da2. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/GB7MC1600209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f7e591dc4b21f3966fdbdc72c552acb502b442da0525e4cef3ca0b3a567998. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GB7MC1600210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09f3aba6af6c7204e0f64fc0953787a2529bc75cd30e24bc729e9958527117d. 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/GB7MC1000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfd7e680974e8483656cc284a7f89fff408888a923fd9971ba7393c31f9ed7b. 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/GB7MC1300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2193251b50bc3b9db05d0d907ad00e01ac49a2f9246938edfdeb8d76859adc. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GB7MC1300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b6e8a6f97b283dfd239cb43295cd0afa9d348ef0b159ad37b3a5b09e346cfa. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-20T00:29:31Z), 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/GB7MC1300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc34b94f127744c3dbfe199c27871d0b2aa285024527b820741a124d4e55728. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:53:36Z), 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/GB7MC1702001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d76c0a283f2155aba3c38f10b98ebe85da7b41c70b33bbae254b22db96667d2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GB7MC2300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae132713c072e4021103c87dd78e486a47ab28a0d382fba3c6fd75e9f6ec4e5. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/GB7MC2300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0290410ec0e0e244bb1dd5832708a22ba3dae1984c74cceb0c7a69ceffd9f492. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/GB7MC2400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb273b8ea7456ec3e18a1b8863fde8a4e42b566321b76932da582dbc87d7ac8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GB7MC2400109.