Doulos (, , Linear B: do-e-ro) is a Greek masculine noun meaning "slave". Doulos may refer to: A slave (δοῦλος) in ancient Greece; see also Slavery in Ancient Rome as well as Slavery in the New Test
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 0x3e2bd5581730fd9b0732bfdafc1cb8dcfaecafda18d8be8a16c3b98425d5e263. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05ab9879-dcf7-48c9-976c-b1e8bfff932f.json and https://artists.proofprofile.net/proofs/artist/05ab9879-dcf7-48c9-976c-b1e8bfff932f.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 0x2cf16a10f173d0cb02e596041d439715b3b566991ea4eb412acd9cbcecc3582f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHNB2153487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc603dd6b3e51935fe395d1c3cbdae55e711d9fd7a6f74d48ca136600d37f146d. 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/QZHNB2153488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b041e8c76c8e756459ea698d4825d69348ab4c2b3964de6ea5a824f5454957. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHNB2153489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff15cab07ea6dcfb1dc3e84c456e50315a5e32b61af0c24ab928a11dcace5385. 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/QZHNB2153490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05360b3ed11488bd8105e40187aa892a7e0f94a5eee6f7d977296c1de5be175. 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/QZHNB2153491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbb994ce3369153e875bb78f02aed54083f7e461e5012cad8893f0d570f9df5. 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/QZHNB2153492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefdf252c5d151a96b2256dd7cf01134e5ff6415b95b8d660f28d01018da6a44. 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/QZHNB2153493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0a344d04d96e4800146eac0926b389047755e685de61da2f8e02ca52c2f0d3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHNB2153494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e82edc6c977accd31047dcfb8f39a9eb7e8c86aaddceaed263b9304fa4c0c47. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHNB2153495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c3e3d1af51fa667b8426151689b3ae7a199e90ff37e7960542e869decf3464. 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/QZHNB2153496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57269d6df9a31a459f15811cc5147c9c4b4ada44cbe27834adbb11c8f4195da. 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/QZNWZ2438720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2094b92d9f886c5150e78a6fe7745ad60d0d1e937935cd65ac21d9a8177987. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6P2410067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5442cfac04a2bed4851ba406be57cd3446b6ec61fb87c6f0087d10c8eeadb3b2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZTB52314952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c663d15d481c95e0707b2f75524190c2a9c8780c5d7a4d58269c604b4596e5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN82385188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0c7464c774ca1a5dacaf2e09ddcd0618e38b2500666f65c6d420543d54dc6e. 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/QZDA62383545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe402f3702b1e831d062ad8ef7f8bbe03ca9f9992e046ce274e95aacb38853fc7. 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/QZMEM2234109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f62f09b37b89b62ebed3c321ff53afd49a2e61526338af6ba038a59a4d92a1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHNB2211425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1f7a3a8d538b01048f0aa7b2eeabf21c86caf0d21da1ce2dfb3b02c6b8e9f6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN42286867.
Cristo, el Ancla Firme y Fuerte (Todo lo Pagó)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6b15c0e88c9848b67e84e8f52ffe2d99eabbdceaf7eb4d0b11dfb04db794a7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZFZ72269129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2d496e7750be62829fe809917eed3bd63f1253fb6ee9c58aeaca14485ea5a0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZMER2126430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990602ac22c627f7006daf907cb057ac98a1c123caf193612221db3b8c401df4. 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/QZNWX2070076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ae0aa38771b91fa50ef4aa3a24bf065a2698facf0c8708c1ef793feb05da00. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZMEN2088914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3ac3d6245859f4c1bbb831a2cd4e0ce4df944dfe01e03b6c1f7977373bab21. 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/QZDA62067185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4090dc5bf6e4871510a863bbf26626c07e3e09654c67ad7b21a73668092c021. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA62067186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803205c7890a3680380d14238eb6607fb8f3ef57fd48789528d0602104c333e6. 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/QZDA62067187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8988354a64892da57805c2ab1e5aabfc60e206612c3e96f0c34e201540afdc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA62067188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc149849bdee845a12c11367a73d7228fbea9ab0328e0ca56b145f9efabf4b050. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA62067189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94de95976725a55aba86de7e55cd7a1fac1c7d984d1e68a722da932733a810b1. 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/QZFYZ2582387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8caa8b5b27171ec2da2da32ec7b2e545b75b2ca8a6f122ab82b8f3466fc5f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTBD2429014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e24f2b05286cac5857b5053dbbdc4f094163185c344a2f38bccc24110c8ed35. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZFZ72372543.